SU392607A1 - ELECTROLUMINESCENT DEVICE - Google Patents

Description

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The invention relates to electroluminescent light sources, in particular electroluminescent devices, which are used to visually display information.

Electroluminescent devices are known that contain two electrodes, at least one of which is transparent, an electroluminescent layer located between them and a dielectric layer of an oxide film, the dielectric layer being located between the electroluminescent layer and the opaque electrode.

The purpose of the invention is to simultaneously increase the contrast and luminance of the electroluminescent device.

This goal is achieved by the fact that in a pre-elimination electroluminescent device the dielectric layer is made of oxides in the form of a thin film, transparent in the visible spectral range, and is located between the transparent electrode and the electroluminescent layer. As the material of the dielectric layer, silicon oxide or germanium is taken or a mixture of oxide components: silicon oxide with boron oxide or silicon oxide with lead oxide.

PA drawing shows the proposed electroluminescent device, the cut.

A transparent substrate / with a transparent conductive film of the electrode 2 is coated with a thin dielectric film 3, made, for example, of silicon oxide, onto which electroluminescent layer 4 is deposited, with which the metal electrode 5 is in contact.

When applying alternating voltage to electrodes 2 and 5, the luminous flux emitted by the electroluminescent layer 4 passes through a thin (0.5-2 microns) dielectric transparent film 3 made, for example, from SiOo, whose electrical strength is 590

mm

A thin dielectric transparent film 3, located between the transparent electrode 2 and the electroluminescent layer 4, acts as an optical filter with a selective transmittance value. This significantly reduces the brightness of the halos and the reflection coefficient of the electroluminescent device for external illumination.

A thin dielectric film has a high dielectric strength, which makes it possible to reduce the thickness of the electroluminescent layer while maintaining the desired dielectric strength of the entire electroluminescent device.

Subject invention

An electroluminescent device containing two electrodes, at least one of which is transparent, and an electroluminescent layer and a dielectric layer of oxide film located between them, characterized in that, in order to simultaneously increase the contrast and brightness of the glow, the dielectric layer is transparent in the visible spectrum has a thickness of not more than 2 microns. and is located between the transparent electrode and the electroluminescent layer.

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