DE838693C - Process for regulating the luminescence and conductivity of single crystal and coarse crystal layers - Google Patents
Process for regulating the luminescence and conductivity of single crystal and coarse crystal layersInfo
- Publication number
- DE838693C DE838693C DEP2844A DEP0002844A DE838693C DE 838693 C DE838693 C DE 838693C DE P2844 A DEP2844 A DE P2844A DE P0002844 A DEP0002844 A DE P0002844A DE 838693 C DE838693 C DE 838693C
- Authority
- DE
- Germany
- Prior art keywords
- conductivity
- luminescence
- layers
- generate
- regulating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000013078 crystal Substances 0.000 title claims description 18
- 238000000034 method Methods 0.000 title claims description 16
- 238000004020 luminiscence type Methods 0.000 title claims description 11
- 230000001105 regulatory effect Effects 0.000 title claims description 3
- 239000012190 activator Substances 0.000 claims description 7
- 230000005855 radiation Effects 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims 1
- 235000015250 liver sausages Nutrition 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 230000002035 prolonged effect Effects 0.000 claims 1
- XYSQXZCMOLNHOI-UHFFFAOYSA-N s-[2-[[4-(acetylsulfamoyl)phenyl]carbamoyl]phenyl] 5-pyridin-1-ium-1-ylpentanethioate;bromide Chemical compound [Br-].C1=CC(S(=O)(=O)NC(=O)C)=CC=C1NC(=O)C1=CC=CC=C1SC(=O)CCCC[N+]1=CC=CC=C1 XYSQXZCMOLNHOI-UHFFFAOYSA-N 0.000 claims 1
- 238000002360 preparation method Methods 0.000 description 10
- 239000000126 substance Substances 0.000 description 8
- 239000004065 semiconductor Substances 0.000 description 3
- 238000011282 treatment Methods 0.000 description 3
- 206010034972 Photosensitivity reaction Diseases 0.000 description 2
- 230000004913 activation Effects 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- 150000004770 chalcogenides Chemical class 0.000 description 2
- 150000001875 compounds Chemical class 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000036211 photosensitivity Effects 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 description 2
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000008030 elimination Effects 0.000 description 1
- 238000003379 elimination reaction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000010348 incorporation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 229910001961 silver nitrate Inorganic materials 0.000 description 1
- 230000004936 stimulating effect Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 229910052725 zinc Inorganic materials 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F30/00—Individual radiation-sensitive semiconductor devices in which radiation controls the flow of current through the devices, e.g. photodetectors
-
- C—CHEMISTRY; METALLURGY
- C03—GLASS; MINERAL OR SLAG WOOL
- C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
- C03C4/00—Compositions for glass with special properties
- C03C4/12—Compositions for glass with special properties for luminescent glass; for fluorescent glass
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/02—Use of particular materials as binders, particle coatings or suspension media therefor
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J29/00—Details of cathode-ray tubes or of electron-beam tubes of the types covered by group H01J31/00
- H01J29/02—Electrodes; Screens; Mounting, supporting, spacing or insulating thereof
- H01J29/10—Screens on or from which an image or pattern is formed, picked up, converted or stored
- H01J29/18—Luminescent screens
- H01J29/20—Luminescent screens characterised by the luminescent material
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/34—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies not provided for in groups H01L21/18, H10D48/04 and H10D48/07, with or without impurities, e.g. doping materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/34—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies not provided for in groups H01L21/18, H10D48/04 and H10D48/07, with or without impurities, e.g. doping materials
- H01L21/46—Treatment of semiconductor bodies using processes or apparatus not provided for in groups H01L21/428
- H01L21/479—Application of electric currents or fields, e.g. for electroforming
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/80—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials
- H10D62/86—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group II-VI materials, e.g. ZnO
- H10D62/864—Semiconductor bodies, or regions thereof, of devices having potential barriers characterised by the materials being Group II-VI materials, e.g. ZnO further characterised by the dopants
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
- H10F71/00—Manufacture or treatment of devices covered by this subclass
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- General Physics & Mathematics (AREA)
- Physics & Mathematics (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Luminescent Compositions (AREA)
Description
Verfahren zur Regelung des Lumineszenz- und Leitvermögens an Einkristall-
und Grobkristallschichten
In der Literatur existieren Angal--#n über Verfahren zur Herstellung größerer Kristalle aus den erwähnten Stoffen, nicht angegeben jedoch werden Behandlungen zur Erzielung bestimmter, jeweils gewünschter Lumineszenz- und Leitfähigkeitseigenschaften an derartigen Kristallen.There are Angal - # n in the literature about methods of manufacture larger crystals from the substances mentioned, but treatments are not specified to achieve specific, desired luminescence and conductivity properties on such crystals.
Die Erfindung betrifft Verfahren, um größeren einheitlichen Kristallen oder kris#tallinün Schichten aus Chalkogeniden von Zn, Cd, Hg oder einem Gemisch ans diesen erfindungsgemäß behandelten Präparaten bestimmte, vor allem sehr hohe oder (losierte Leucht- und Leitfähigkeiten zu ertei len.The invention relates to processes for giving larger, uniform crystals or crystalline layers of chalcogenides of Zn, Cd, Hg or a mixture of these preparations treated according to the invention certain, above all very high or loose luminous and conductivity capacities.
Die betreffenden Präparate erhalten ein extrem hohes Leuchtvermögen (entsprechend den besten Lichtausbeuten technischer polykrista,lliner Leuchtstoffe), indem man sie direkt im Anschluß an die Herstellung oder auch nachträglich von höherer Temperatur (> ioo' C) verhältnismäßig schnell auf Zimmertemperatur abkühlt, beispielsweise in einer Luft- oder Sauerstoffatmosphäre. Durch diese Behandlung wird gleichzeitig eine gleichmäßige Durchaktivierung der Präparate erzielt. So wurden beispielsweise CdS-Kristalle im Anschluß an die 1 lerstellung von i8o' C innerhalb etwa einer Minute in Luft auf 20"C abgekühlt und dadurch stark rot Imnineszierende Kristalle mit einer gleichmäßigen physikalischen Lichtausheute Voll 2390 bei Anregung durch a-Tcilchen erhalten; das beste käufliche ZnS-Cu besitzt eine Ausbeute von 250/0. The preparations in question have an extremely high luminosity (corresponding to the best light yields of technical polycrista, lliner phosphors) when they are cooled relatively quickly from a higher temperature (> 100 ° C) to room temperature, for example in a Air or oxygen atmosphere. This treatment also enables the preparations to be evenly activated. For example CdS-crystals were following the 1 lerstellung of i8o 'C within about one minute in air at 20 "C cooled and thereby strongly red Imnineszierende crystals having a uniform physical Lichtausheute full 2390 when excited by a-Tcilchen obtained; the best Commercially available ZnS-Cu has a yield of 250/0.
Die nach diesem Verfahren hergestellten Leuchtniassün besitzen nicht die vielfach störenden Streu-Lind Absorptionseigenschaften polykristalliner Stoffe. Sie eignen sich deshalb besonders als Leuchtstoff im 1.etichtmassenzähler, vor allem sind sie zur quantitativen Zählung einzelner energiereicher Teilchen unerläßlich.The Leuchtniassün produced by this process do not have the often disruptive scatter and absorption properties of polycrystalline substances. Therefore Y ou are particularly suitable as fluorescent in 1.etichtmassenzähler, above all, they are for quantitative counting of individual energy particles is essential.
Die nach dem beschriebenen Verfahren behandelten Präparate besitzen außerdem neue, bisher noch nicht an derartigen Substanzen nachgewiesene Leitfähigkeitseigenschaften: Sie stellen Halbleiter dar, d. h. sie besitzen auch ohne Anregung ein beträchtliches Leitvermögen (Dauerleiter). So wurde beispielsweise aneinem nach diesem Verfahren hergestellten GdS-Kristalt ein spezifischer Widerstand von i ooo Ohm - Zentimeter gemessen. Verwendet \%-,erden kötinen diese Präparate bei geeigneter Elektrod,enanordnung sowohl zum Gleichrichten und Steuern elektrischer Ströme als auch zur Herstellung von Photoelementen für Quanten- und Korpuskularstrahlen.The preparations treated according to the method described also have new conductivity properties that have not yet been demonstrated in such substances: They are semiconductors, i.e. they are semiconductors. H. they have a considerable conductivity even without stimulation (permanent conductor). For example, a GdS crystal produced using this method was measured to have a specific resistance of 100 ohms - centimeters. If the electrodes are arranged appropriately, these preparations are used to ground and control electrical currents as well as to produce photo elements for quantum and corpuscular rays.
Verändert man das beschriebene Verfahren derart, daß die Ausgangstemperatur niedriger liegt, oder derart, (laß die Abkühlung langsamer erfolgt, so erhält man Schichten, deren Lumineszenz- oder Leitvermögen um so geringer ist, je tiefer die ..Nusgangstemperatur liegt und je geringer die Ab- kühlungsgeschwindigkeit ist. Während die nach (fein eingangs beschriebenen Verfahren hergestellten Leuchtmassenein derart hohes DunkelleitvermÖgen besitzen, daß sie praktisch Halbleiter darstellen (deshalb mit Dauerleiter bezeichnet) und eine Erhöhung des LeitvermÖgens durch Anregung kaum noch möglich ist, besitzen die nach dem geänderten Verfahren behandelten Präparate eine nur geringe Dunkelleitfähigkeit, die gegenüber der bei Anregung erzeugten Leitfähigkeit vernachlässigt %%-erden kann. Durch dieses geänderte Verfahren kann somit den erfindungsgemäßen Präparaten eine hohe Photoempfindlichkeit für Quanten- und Korl-niskularstrahlung erteift werden.By changing the described method such that the outlet temperature is lower, or such (leave the cooling is slower, we obtain layers whose luminescence or conductivity is lower by the deeper is the ..Nusgangstemperatur and the lower the Ab - initially described method Leuchtmassenein such a high DunkelleitvermÖgen produced is cooling speed during the finely according to (have that they practically semiconductor represent (therefore designated by the time manager) and an increase in the conductivity by excitation is hardly possible, possess the treated according to the modified method of preparation. only low dark conductivity, which can be neglected compared to the conductivity generated upon excitation.
Die bisher beschriebenen Verfahren führen unserer Meinung nach zu einer Eigenaktivierung I der Präparate. Da die Lumineszenz- und Leitfähigkeifseigenschaften wesentlich von der Art des Aktivators abhängen, ist für gewisse Zwecke der Einbau anderer Aktivatoren von Wichtigkeit. Um dies zu erreichen, werden die zunächst ohne Aktivierung hergestellten Präparate zusammen mit der erforderlichen Menge des Aktivatorrnctalls oder einer den Aktivator enthaltenden Verbindung in einem zugeschmolzenen (beispielsweise evakuierten) Gefäß längere Zeit bei einer Temperatur >200' C gC-tümpert. Zweckmäßig wird man den Präparaten außerdem polykristallines Pulver gleicher Zusamm,ens-etzung beifügen, wodurch eine gleichmäßigere Durchaktivierung erreicht werden kann. je nach Art und Menge des gewählten Aktivators erhält man die betreffenden Objekte mit den entsprechenden Lumineszenz- und Leitfähigkeitseigenschaften. So wurden beispielsweise i g CdS-Kristalle zusammen mit einer Spur Silber (i cm3 Silbernitratlösung, die 2 - io#I g ,#g+ enthielt) in einem auf io-5 cm ausgepumpten Quarzrohr zwei Stunden lang bei 300' C gctempert und dadurch an den Kristallen gutes Lumineszenzvermögen (Lichtausbeute i8»/o), vor allem aber günstige Leitfähigkeitseigenschaften (hohe Pliotoempfindlichkeit bei gleichzeitiger geringer Trägheit) erzielt.In our opinion, the methods described so far lead to self-activation I of the preparations. Since the luminescence and conductivity properties essentially depend on the type of activator, the incorporation of other activators is important for certain purposes. In order to achieve this, the preparations initially produced without activation, together with the required amount of the activator metal or a compound containing the activator, are kept in a sealed (for example evacuated) vessel at a temperature of> 200 ° C. for a longer period of time. It is also advisable to add polycrystalline powder of the same composition to the preparations, so that more even activation can be achieved. Depending on the type and amount of activator selected, the objects in question are obtained with the corresponding luminescence and conductivity properties. For example, i g of CdS crystals together with a trace of silver (i cm3 of silver nitrate solution containing 2 - io # I g , # g +) were heated for two hours at 300 ° C. in a quartz tube which had been pumped down to 10 cm the crystals have good luminescence properties (luminous efficacy i8 »/ o), but above all favorable conductivity properties (high pliotosensitivity with simultaneous low inertia).
Soll die Lutnineszenz nicht gleichmäßig über die ganze Leuchtschicht verteilt sein, so kann dies durch folgende nachträgliche, Behandlung der zunächst gleichmäßig lumineszierenden Fläche erreicht werden: Die Stellen, die eine geringere oder praktisch keine Lumineszenz aufweisen sollen, werden längere Zeit der Wirkung von energiereichen Atomstrahlen, beispielsweise a-Strahlen, ausgesetzt, wodurch die Lichtausbeute dies-er Teile dosiert herabgesetzt werden kann. So läßt sich z. B. die Lumineszenzausl).eute von einem i cm2 großen CdS-Kristall durch dreitägige Einwirkung einer a-Aktivität von i mC auf die Hälfte herabsetzen. Man kann durch dieses Verfahren auf den erfindungsgemäß hergestellten Leuchtschichten Schriftzeichen oder andere unsichtbare Kennzeichen anbringen, die nur bei Anregung der Lumineszenz sichtbar werden.Should the lutninescence not be uniform over the entire luminous layer be distributed, this can be done by the following subsequent treatment of the initially evenly luminescent surface can be achieved: The bodies that have a lower or should have practically no luminescence, the effect will be longer exposed to high-energy atomic beams, for example a-rays, whereby the light output of these parts can be reduced in a dosed manner. So z. B. the Lumineszenzausl) .eute from an i cm2 CdS crystal through three-day Reduce exposure to a activity of i mC by half. You can go through this method on the luminous layers produced according to the invention characters or attach other invisible markings that only work when the luminescence is excited become visible.
Durch das gleiche Verfahren wird die Photoempfindlichkeit der durch energicreiche Atomstrahlen veränderten Stellen erhöht. Beispielsweise wurde der bei Anregung vorhandene spezifische Widerstand einer mit einem a-Präparat von i mC bestrahlten I CM2 großen Fläche eines vorher' kaum aktiviertenCdS-Kristalles durch eine dreitägigeBestrahlung von 5o Meg0hm - Zentimeter auf o,oi Mcg0hm - Zentimeter verringert, also um einen Faktor 5000. Unter anderem ist diese Erzielung einer örtlich dosierten Störstel.Iendichte wichtig für die Verwendung der betreffenden Ob- jekte als GJeichrichtcr oder Photoelement.The same process increases the photosensitivity of the areas affected by high-energy atomic beams. For example, the specific resistance of an I CM2 large area of a previously barely activated CdS crystal that was irradiated with an a preparation of i mC was reduced by a three-day irradiation from 50 megohm- centimeters to o, oi mcgohm - centimeters, i.e. by a factor 5000. Among other things, this is obtaining a locally metered Störstel.Iendichte important for the use of the relevant Obwalden projects as GJeichrichtcr or photocell.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP2844A DE838693C (en) | 1949-05-07 | 1949-05-07 | Process for regulating the luminescence and conductivity of single crystal and coarse crystal layers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP2844A DE838693C (en) | 1949-05-07 | 1949-05-07 | Process for regulating the luminescence and conductivity of single crystal and coarse crystal layers |
Publications (1)
Publication Number | Publication Date |
---|---|
DE838693C true DE838693C (en) | 1952-05-12 |
Family
ID=7358293
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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DEP2844A Expired DE838693C (en) | 1949-05-07 | 1949-05-07 | Process for regulating the luminescence and conductivity of single crystal and coarse crystal layers |
Country Status (1)
Country | Link |
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DE (1) | DE838693C (en) |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1009021B (en) * | 1952-06-19 | 1957-05-23 | British Thomson Houston Co Ltd | Process for the production of luminous surfaces |
DE1046794B (en) * | 1955-02-15 | 1958-12-18 | Emi Ltd | Process for forming a photoconductive layer on a carrier layer |
DE1087703B (en) * | 1955-03-26 | 1960-08-25 | Philips Nv | Asymmetrically conductive semiconductor arrangement |
DE1144415B (en) * | 1959-06-04 | 1963-02-28 | Philips Nv | Process for the production of coherent photoconductive or luminous layers or layers for optical filters |
DE1162010B (en) * | 1962-06-26 | 1964-01-30 | Forschungslaboratorium Prof Dr | Process for the production of multi-layer high-resistance semiconductor layers for photoresistors |
DE1194996B (en) * | 1959-11-28 | 1965-06-16 | Philips Nv | Semiconductor device, especially photosensitive device |
DE1199897B (en) * | 1962-04-03 | 1965-09-02 | Philips Nv | Process for the production of a barrier layer in an n-conducting cadmium sulfide body |
DE1246136B (en) * | 1956-03-22 | 1967-08-03 | Philips Nv | Method for producing a radiation-sensitive body |
DE1257302B (en) * | 1961-07-01 | 1967-12-28 | Tesla Np | Photoresistor |
-
1949
- 1949-05-07 DE DEP2844A patent/DE838693C/en not_active Expired
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1009021B (en) * | 1952-06-19 | 1957-05-23 | British Thomson Houston Co Ltd | Process for the production of luminous surfaces |
DE1046794B (en) * | 1955-02-15 | 1958-12-18 | Emi Ltd | Process for forming a photoconductive layer on a carrier layer |
DE1087703B (en) * | 1955-03-26 | 1960-08-25 | Philips Nv | Asymmetrically conductive semiconductor arrangement |
DE1246136B (en) * | 1956-03-22 | 1967-08-03 | Philips Nv | Method for producing a radiation-sensitive body |
DE1144415B (en) * | 1959-06-04 | 1963-02-28 | Philips Nv | Process for the production of coherent photoconductive or luminous layers or layers for optical filters |
DE1194996B (en) * | 1959-11-28 | 1965-06-16 | Philips Nv | Semiconductor device, especially photosensitive device |
DE1257302B (en) * | 1961-07-01 | 1967-12-28 | Tesla Np | Photoresistor |
DE1199897B (en) * | 1962-04-03 | 1965-09-02 | Philips Nv | Process for the production of a barrier layer in an n-conducting cadmium sulfide body |
DE1162010B (en) * | 1962-06-26 | 1964-01-30 | Forschungslaboratorium Prof Dr | Process for the production of multi-layer high-resistance semiconductor layers for photoresistors |
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