CN206361522U - A kind of solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LED - Google Patents

Abstract

The utility model belongs to the technical field of simulated light sources, in particular to a solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs. The utility model system includes a light source module, a dimming system, a focusing lens, a light mixer and a light distribution lens group. The light source module includes K monochromatic light quantum dot LED light sources or ultraviolet LED light sources with different peak wavelengths. Converge the monochromatic light at the light mixer at the common focus of the focusing lens, and then mix the monochromatic light into simulated sunlight or simulated black body radiation light with a wavelength in the range of 200−1200 nm by the light mixer, and finally pass through It exits after the light distribution lens group. When the solar spectrum and blackbody radiation spectrum simulation system of the utility model synthesizes the target spectrum, under ideal implementation conditions, the correlation coefficient r between the synthesized light and the target spectrum within 400-730 nm is greater than 0.99, and the color temperature deviation ΔCCT is less than 100 K. The index Ra is greater than 98, the special color rendering index R1−R15 is greater than 96, and the color tolerance SDCM is less than 1.

Description

A solar spectrum and black body radiation spectrum simulation system based on quantum dot LED

technical field

The utility model belongs to the technical field of simulated light sources, in particular to a solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs.

Background technique

Quantum dots are fluorescent nanomaterials, made of semiconductor materials synthesized from zinc, selenium, cadmium, sulfur and other elements, with a diameter of 2−10 nm. The quantum confinement effect of quantum dots is very obvious. It can confine the carriers in the semiconductor to a very small space. Once the carriers are stimulated by light or electricity, the carriers will be excited and jump to a higher energy level. . When these carriers return to their original lower energy levels, they emit visible light of a fixed wavelength. Compared with traditional fluorescent materials, the advantage of quantum dots is that the luminous wavelength can be adjusted by the size of quantum dots. The smaller the diameter of quantum dots, the smaller the wavelength of light after excitation, which changes the chemical composition of quantum dot materials and the diameter of particles. The fluorescence emission wavelength can cover the entire visible spectrum and part of the infrared spectrum; it has good linear optical properties, stable performance, can withstand repeated excitations, and has high luminous efficiency; it does not need to mix a variety of phosphors, and the packaging is simple. The cost is lower; the size of the quantum dot itself is smaller than the wavelength of visible light, and there is less light scattering and other light loss phenomena.

At present, most quantum dot-based light sources use ultraviolet LEDs to excite quantum dot fluorescent materials of different sizes to emit a variety of monochromatic light to obtain a white light spectrum mixed. Since the emission spectrum of quantum dots can theoretically cover the entire visible spectrum and part of the infrared spectrum, and its half-width can be modulated by continuously changing the size of quantum dots, in the case of reasonable selection of quantum dot materials and sizes, based on quantum dots The LED light source can obtain a very continuous synthetic spectrum, which is an ideal light source for synthesizing the solar spectrum or black body radiation spectrum.

There are two types of existing solar spectrum or blackbody radiation spectrum simulation systems, one is to use light sources such as xenon lamps and metal halide lamps, and cooperate with some specific filters to make the final output spectrum close to the target spectrum. The other is to use LEDs of different colors to combine light sources, and adjust the spectra of single-color LEDs one by one to compensate each other, and at the same time use some specific filters to match the target spectrum. Patent CN200910200631 proposes a dimming method for solar spectrum LEDs, using integrated packaging with multiple LED chips of different colors covering the visible light range as light sources, and formulating and correcting the multi-color LED chips required for simulating sunlight with different color temperatures through theoretical calculations and experiments. The ratio of the radiant flux of a monochromatic LED to match the target spectrum to simulate various lighting scenarios. Patent CN201210483543 proposes a method for simulating sky light spectrum based on artificial light source, selects metal halide light source as the main simulated light source for sky light spectrum in the range of 400-2500 nm, and uses high-power LED as the spectrum in the range of 400-600 nm Compensate the light source, select the corresponding filter to correct the spectrum of the metal halide light source in the range of 600-2500 nm, and realize the full-spectrum sky light simulation in the range of 400-2500 nm at a lower cost.

It is difficult for the simulated spectrum obtained by the above method to match the real solar spectrum or black body radiation spectrum with a high correlation coefficient, in fact, the deviation is always large. The quantum dot LED light source benefits from the advantages of multi-spectral narrow-band emission, especially its easy-to-adjust and controllable spectrum and stable performance. It has become an ideal light source for the future new solar spectrum and black body radiation spectrum simulation system. At present, most of the research on quantum dot LEDs is still in the laboratory stage, but quantum dot materials have shown good performance in experiments, and their theoretical luminous efficacy is comparable to that of phosphorescent OLEDs (100 lm/W). The simulation of both general lighting and special light sources has great potential.

Contents of the invention

The purpose of this utility model is to provide a solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs,

The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LED provided by the utility model includes a light source module, a dimming system, a focusing lens, a light mixer and a light distribution lens group; wherein, the light source module includes K( K≥10) monochromatic light quantum dot LED light sources or ultraviolet LED light sources with different peak wavelengths, through the focusing lens, the monochromatic light is converged on the light mixer at the common focus of the focusing lens, and then the single light is combined by the light mixer The colored light is mixed into simulated sunlight or simulated blackbody radiation with a wavelength in the range of 200−1200 nm, and finally exits through the light distribution lens group; because the quantum dot LED light source has the advantages of controllable peak wavelength and adjustable half-value full width , the spectrum synthesized by multiple monochromatic light quantum dot LED light sources has a high degree of fitting relative to the real solar spectrum or black body radiation spectrum.

In the light source module, the peak wavelength of each monochromatic light quantum dot LED light source is within the range of 380−1200 nm, and a value interval is determined within the range of 380−1200 nm according to the wavelength range of the target spectrum, so that each quantum dot The peak wavelength of the LED light source is distributed in the value range.

When the wavelength range of the target spectrum includes 200-380 nm, several ultraviolet LED light sources with peak wavelengths in the range of 200-380 nm can be used to compensate for the absence of quantum dot LED light sources in the ultraviolet band.

The light source in the light source module can be a quantum dot LED packaging device group, an ultraviolet LED excitation light source+quantum dot fluorescent plate, or an ultraviolet LED packaging device.

When the light source is a quantum dot LED packaging device, it includes a heat sink, an ultraviolet LED chip, a quantum dot phosphor layer, a lens, and packaging materials.

When the light source is an ultraviolet LED excitation light source+quantum dot fluorescent plate, each quantum dot fluorescent plate is coated with quantum dot phosphor powder with different emission wavelengths, and the quantum dot phosphor powder is excited by the corresponding ultraviolet LED excitation light source and emits various A monochromatic light.

When the light source is an ultraviolet LED packaging device, its peak wavelength is in the range of 200−380 nm, and the packaging material can be inorganic material (SiO ₂ ) or silicone resin.

Each light source in the light source module is equipped with a focus lens, and the focus of the focus lens is at the entrance of the light mixer. The monochromatic light emitted by each light source is focused by the focus lens equipped respectively. , converging to the entrance of the light mixer and mixing these monochromatic lights into synthetic light close to the target spectrum by the light mixer.

The light distribution lens group is optically designed according to specific application requirements to obtain the required light intensity distribution.

When the application requirement of the solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LED is specifically a solar simulator, the light distribution lens group is designed to convert the incident light into parallel light before emitting it.

The dimming system adopts direct current (DC) dimming, pulse width modulation (PWM) dimming or liquid crystal dimming glass to control the radiant flux of each light source.

When the dimming system adopts direct current (DC) dimming, the radiation flux of each light source is controlled by changing the magnitude of the current.

When the dimming system adopts pulse width modulation (PWM) dimming, the radiation flux of each light source is controlled by changing the pulse duty cycle.

When the dimming system uses liquid crystal dimming glass, a liquid crystal glass unit is sandwiched between each light source and the focusing lens equipped with it, and the transmittance of the liquid crystal glass unit is adjusted by changing the voltage at both ends of the liquid crystal glass unit by the control electrode , thereby controlling the radiant flux of each light source.

The dimming system is preset with multiple sets of dimming data of different solar spectra or blackbody radiation spectra of different color temperatures, which can be quickly dimmed according to requirements, and the light source modules are driven to combine to form the required spectrum.

The dimming data of blackbody radiation spectra with different solar spectra or different color temperatures are simulated and corrected by theoretical calculations. The different solar spectral spectra used as dimming targets are the results of field measurements, and the blackbody radiation spectra with different color temperatures are Plane Calculation result of the gram formula.

Compared with the existing solar spectrum and blackbody radiation spectrum simulation system, the utility model has the following advantages:

The quantum dot LED-based solar spectrum and blackbody radiation spectrum simulation system of the utility model has the advantages of controllable peak wavelength and half-value full width modulation of the quantum dot LED light source. Compared with the real solar spectrum or blackbody radiation spectrum, the synthesized spectrum The degree of fit is extremely high.

The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs of the utility model uses quantum dot LEDs as light sources, and its principle is to use ultraviolet LEDs to excite quantum dot phosphors to emit light, avoiding the color drift and inconsistent light decay of traditional phosphors, etc. problem, ensuring the color stability of the spectral simulation system.

The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs of the utility model, when synthesizing the visible light part of the target spectrum, the peak wavelength distribution of the monochromatic quantum dot LED light source is within the range of 380−780 nm, by rationally adjusting each quantum The radiant flux of the point LED light source can make the color rendering index R1−R15 of the synthetic light all greater than 96. In an ideal implementation, the correlation coefficient r between the synthetic light and the target spectrum within 400-730 nm is greater than 0.99, the color temperature deviation ΔCCT is less than 100 K, the general color rendering index Ra is greater than 98, and the special color rendering index R1-R15 is greater than 96. Tolerance SDCM is less than 1. It is far superior to the existing solar spectrum or black body radiation spectrum simulation system.

Description of drawings

FIG. 1 is a three-dimensional rendering of the system of Embodiment 1.

FIG. 2 is a system sectional view of Embodiment 1. FIG.

FIG. 3 is a three-dimensional rendering of the system of Embodiment 2.

4 is a system sectional view of Embodiment 2.

FIG. 5 is a three-dimensional rendering of the system of Embodiment 3.

FIG. 6 is a system sectional view of Embodiment 3. FIG.

7 is a relative spectral distribution diagram of the quantum dot LED light source in Example 1.

FIG. 8 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 2700 K black body line.

FIG. 9 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 3000 K blackbody line.

Fig. 10 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 3500 K black body line.

Fig. 11 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 4000 K black body line.

Fig. 12 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 4500 K black body line.

Fig. 13 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 5000 K black body line.

Fig. 14 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 5500 K black body line.

Fig. 15 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 6000 K black body line.

Fig. 16 is a comparison diagram of the synthesized spectrum of the quantum dot LED in Example 1 and the 6500 K blackbody line.

detailed description

The embodiments described below are only some embodiments of the present invention. All other embodiments without creative achievements based on the embodiments of the present utility model belong to the protection scope of the present utility model.

Embodiment 1: Ultraviolet LED excitation light source + quantum dot fluorescent plate + out of focus + beam angle of 120° (black body radiation simulation light source).

Embodiment 2: Quantum dot LED packaging device+out of focus+parallel light (solar simulator).

Embodiment 3: Ultraviolet LED excitation light source+quantum dot fluorescent plate+focus+parallel light (sunlight simulator).

Example 1:

Embodiment 1 is a black body radiation simulation light source with ultraviolet LED excitation light source + quantum dot fluorescent plate, including a light source module, a dimming system, a focusing lens, a light mixer and a light distribution lens group. The light source module contains 25 monochromatic light quantum dot LED light sources with different peak wavelengths, which are arranged in a 5×5 matrix arrangement. Each light source is driven to emit light by the dimming system, and each light source is equipped with a focusing lens. The focal points of all focusing lenses are at the same position, and the entrance of the light mixer is also at this position. The monochromatic light emitted by each light source is converged by its equipped focusing lens to the entrance of the light mixer at the focal point, and the different monochromatic lights are mixed by the light mixer, and finally the combined light is completed by the light distribution lens group After allocation, exit, as shown in Figure 1.

The peak wavelength of the light source is evenly distributed in the range of 380−780 nm, here the peak wavelength is set at an interval of 20 nm, so at least the peak wavelengths of 380, 400, 420, 440, 460, 480, 500, 520, 540, 560 are included , 580, 600, 620, 640, 660, 680, 700, 720, 740, 760, 780 nm quantum dot LED light source each.

Control and drive devices such as dimming systems can be installed under the quantum dot LED light source matrix, as shown in Figure 2.

When the 5×5 matrix light source described in this example is installed, the normal line of the light emitting surface of the light source does not pass through the focal point of the focusing lens. The light sources at different positions are installed side by side, and their light-emitting surfaces have the same direction, as shown in Figure 2. Therefore, the focusing lens equipped with each light source needs to be individually designed so that the light emitted by the light sources at different positions can be focused on the light mixer. The location of the entrance.

This embodiment is specifically a blackbody radiation simulation light source, and its light distribution lens group is designed to convert incident light into outgoing light with a beam angle of 120°, as shown in FIG. 2 .

A quantum dot LED-based solar spectrum and blackbody radiation spectrum simulation system obtained by implementing the method can ideally simulate the solar spectrum or blackbody radiation spectrum by adjusting the radiant flux of each quantum dot LED light source through the dimming system. According to the relative spectral distribution of quantum dot LEDs with different peak wavelengths measured by experiments, the spectra of these monochromatic light quantum dot LED light sources are synthesized with a certain radiant flux ratio, and 2700 K, 3000 K, 3500 K, 4000 K, 4500 K The simulation results of the blackbody radiation spectrum at K, 5000 K, 5500 K, 6000 K, and 6500 K are shown in Fig. 11−19. Its simulation effect is shown in Table 1:

Table 1 Comparison of synthetic spectrum of quantum dot LED and blackbody radiation spectrum

It should be noted that the correlation coefficient r is only calculated in the range of 400−730 nm. If it is necessary to obtain an ideal correlation coefficient in a wider range, it is necessary to increase the value range of the peak wavelength of the quantum dot LED light source.

The correlation coefficient r between the synthetic spectrum of this embodiment and each target spectrum within 400−730 nm is greater than 0.99, the color temperature deviation ΔCCT is less than 60 K, the color rendering index Ra is greater than 98, the ninth special color rendering index R9 is greater than 96, and R1− All R15 is greater than 96, and SDCM is less than 1, which is far superior to the existing solar spectrum or black body radiation spectrum simulation system.

Example 2:

Embodiment 2 is a solar simulator whose light source is a quantum dot LED packaged device, including a light source module, a dimming system, a focusing lens, a light mixer, and a light distribution lens group. The light source module contains 25 monochromatic light quantum dot LED light sources with different peak wavelengths, which are arranged in a 5×5 matrix arrangement. Each light source is driven to emit light by the dimming system, and each light source is equipped with a focusing lens. The focal points of all focusing lenses are at the same position, and the entrance of the light mixer is also at this position. The monochromatic light emitted by each light source is converged by its equipped focusing lens to the entrance of the light mixer at the focal point, and the different monochromatic lights are mixed by the light mixer, and finally the combined light is completed by the light distribution lens group After allocation, exit, as shown in Figure 4.

The peak wavelength of the light source is evenly distributed in the range of 380−780 nm, and the peak wavelength is set at an interval of 25 nm, so at least the peak wavelengths of 380, 405, 430, 455, 480, 505, 530, 555, 580, and 605 are included , 630, 655, 680, 705, 730, 755, 780 nm quantum dot LED light source each.

Control and driving devices such as dimming system can be installed under the quantum dot LED light source matrix, and no illustration is given here.

When the 5×5 matrix light source described in this example is installed, the normal line of the light emitting surface of the light source does not pass through the focal point of the focusing lens. The light sources at different positions are installed side by side, and their light-emitting surfaces have the same direction, as shown in Figure 2. Therefore, the focusing lens equipped with each light source needs to be individually designed so that the light emitted by the light sources at different positions can be focused on the light mixer. The location of the entrance.

This embodiment is specifically a solar simulator, so the light distribution lens group is designed to convert incident light into parallel light and emit it, as shown in FIG. 4 .

Example 3:

Embodiment 3 is a solar simulator whose light source is ultraviolet LED excitation light source + quantum dot fluorescent plate and ultraviolet LED packaging device, including a light source module, a dimming system, a focusing lens, a light mixer and a light distribution lens group. The light source module contains 25 monochromatic light quantum dot LED light sources (ultraviolet LED module + quantum dot fluorescent module) with different peak wavelengths, which are arranged in a circular arrangement, and 25 quantum dot LED light sources are evenly distributed along a circle . Each light source is driven to emit light by the dimming system, and each light source is equipped with a focusing lens. The focal points of all focusing lenses are at the same position, and the entrance of the light mixer is also at this position. The monochromatic light emitted by each light source is converged by its equipped focusing lens to the entrance of the light mixer at the focal point, and the different monochromatic lights are mixed by the light mixer, and finally the combined light is completed by the light distribution lens group After allocation, exit, as shown in Figure 7.

The peak wavelength of the light source is evenly distributed in the range of 280−900 nm. Quantum dot LED light sources are used for the visible spectrum and infrared spectrum, and ultraviolet LED packaged devices are used for the ultraviolet spectrum. Here, the peak wavelength is set at intervals of 25 nm, so at least the peak Quantum dot LED light sources with wavelengths of 380, 405, 430, 455, 480, 505, 530, 555, 580, 605, 630, 655, 680, 705, 730, 755, 780, 805, 830, 855, 880 nm One and one UV LED packaging device with peak wavelengths of 280, 305, 330, and 355 nm.

The control and driving devices such as the dimming system can be installed in the center of the circular area surrounded by the quantum dot LED light source, as shown in Figure 8.

When the circular arrangement light source described in this example is installed, the normal line of the light emitting surface of the light source passes through the focal point of the focusing lens. The light sources at different positions are installed on the spherical surface with the focal point of the focusing lens as the center, and the light emitting surface faces the focal point of the focusing lens, as shown in Figure 9. Therefore, all focusing lenses are identical, and only one focusing lens needs to be optically designed for application. To all, so that the light emitted by the light source at different positions is focused to the position of the entrance of the light mixer.

This embodiment is specifically a solar simulator, so the light distribution lens group is designed to convert incident light into parallel light and emit it, as shown in FIG. 6 .

Claims (9)

1. A solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs, characterized in that it comprises a light source module, a dimming system, a focusing lens, a light mixer and a light distribution lens group, and utilizes the quantum dot LED light source peak wavelength Controllable, full width at half value can be modulated, using multiple monochromatic light quantum dot LED light sources to mix to obtain a highly fitting simulated solar spectrum or blackbody radiation spectrum; where: The light source module includes K monochromatic light quantum dot LED light sources or ultraviolet LED light sources with different peak wavelengths, the monochromatic light is converged to the light mixer at the common focal point of the focusing lens through the focusing lens, and then the light mixing The device mixes the monochromatic light into simulated sunlight or simulated black body radiation with a wavelength in the range of 200−1200 nm, and finally passes through the light distribution lens group before exiting; K≥10; The peak wavelength of the monochromatic light quantum dot LED light source is in the range of 380-1200 nm, and the peak wavelength of the ultraviolet LED light source is in the range of 200-380 nm. 2. The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs according to claim 1, wherein the light source in the light source module is a quantum dot LED packaging device group, or an ultraviolet LED excitation light source+ Quantum dot phosphor plate, or UV LED packaging device. 3. the solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LED according to claim 2, is characterized in that, described quantum dot LED encapsulation device comprises heat sink, ultraviolet LED chip, quantum dot phosphor layer, lens and packaging material. 4. the solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LED according to claim 2, is characterized in that, described ultraviolet LED excites light source and quantum dot fluorescent board, and its each quantum dot fluorescent board is coated with Quantum dot phosphors with different emission wavelengths, the quantum dot phosphors are excited by corresponding ultraviolet LED excitation light sources and emit various monochromatic lights. 5. The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs according to claim 2, wherein the packaging material of the ultraviolet LED packaging device is an inorganic material or silicone resin. 6. The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs according to claim 1, wherein each light source in the light source module is equipped with a focusing lens, and the focus of the focusing lens is At the entrance of the light mixer, the monochromatic light emitted by each light source is focused by the focusing lens provided respectively, and converges to the entrance of the light mixer, where the monochromatic light is mixed by the light mixer. 7. The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs according to claim 1, wherein the light distribution lens group is optically designed according to specific application requirements to obtain the required light intensity distribution. 8. The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs according to claim 7, wherein the light distribution lens group converts the light emitted by the light mixer into parallel light to meet the requirements of sunlight. Simulator application requirements. 9. The solar spectrum and blackbody radiation spectrum simulation system based on quantum dot LEDs according to claim 1, wherein the dimming system adopts direct current DC dimming, pulse width modulation PWM dimming or liquid crystal dimming glass control The radiant flux of each light source; where: The direct current DC dimming controls the radiant flux of each light source by changing the magnitude of the current; The pulse width modulation (PWM) dimming controls the radiant flux of each light source by changing the pulse duty cycle; The liquid crystal switchable glass is sandwiched between the light source and the focusing lens provided with it, and the voltage at both ends of the liquid crystal glass unit is changed by the control electrode to adjust the transmittance of the liquid crystal glass unit, thereby controlling the radiation flux of each light source .