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Light emitting device based on oleds

A technology of light-emitting devices and light-emitting diodes, which is applied in the direction of semiconductor devices, electrical components, circuits, etc., and can solve problems such as reduction of light emission

Active Publication Date: 2012-05-23
BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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  • Abstract
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Problems solved by technology

In order to improve the luminous power efficiency of such white OLEDs, the technique of the above-mentioned dual-cavity structure cannot be used, because the tuning of the additional microcavity only improves the performance of one color in the range of about 90 nm, where the light emission outside this wavelength range is greatly reduced. reduce
Using this principle with such white OLEDs could thus improve efficiency for only one color and reduce emission for other colors

Method used

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  • Light emitting device based on oleds
  • Light emitting device based on oleds
  • Light emitting device based on oleds

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Embodiment Construction

[0020] The proposed inventive device comprises several groups of stripe-shaped OLEDs arranged side by side on an optically transparent carrier substrate. figure 1 An example of the structure of one of these OLEDs with an optimized RC2 design is shown. The OLED 1 is composed of a first layered structure 2 forming a first microcavity and a second layered structure 3 on a carrier substrate 4 forming a second microcavity.

[0021] The first layered structure 2 forms a conventional OLED known in the art. The layered structure 2 comprises a thin transparent anode layer 5 such as ITO or AZO, a hole injection layer 6, a hole transport layer 7, an emissive layer 8, an electron transport layer 9, an electron injection layer 10 and, for example, made of Al, Ag or any other suitable metal to form the cathode layer 11. The emissive organic layer 8 is a layer in which electrons and holes recombine to emit desired light.

[0022] The second layered structure 3 is arranged between the anod...

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Abstract

The present invention relates to a light emitting device comprising several groups of stripe shaped organic light emitting diodes (15, 16, 17) arranged side by side on an optically transparent carrier substrate (4). The organic light emitting diodes (15, 16, 17) comprise a first layer sequence (2) forming a first microcavity. At least one of the organic light emitting diodes (15, 16, 17) of each group comprises a second layer sequence (3) forming a second microcavity between the second electrode layer (5) and the carrier substrate (4). The second microcavity is adapted in thickness of at least one of its layers to increase light out put of the corresponding organic light emitting diode (15, 16, 17). A scatter or diffuser element (14) is arranged in an emission direction of the organic light emitting diodes (15, 16, 17) in front of the carrier substrate (4), to mix the light of said different colors of each group leaving the carrier substrate. The present device allows the emission of white light with a high efficacy.

Description

technical field [0001] The invention relates to a light emitting device comprising groups of organic light emitting diodes (OLEDs) arranged side by side on an optically transparent carrier substrate, said organic light emitting diodes comprising at least an organic layer or layer stack between a first and a second electrode layer A first layer sequence, the first and second electrode layers form a first microcavity, and each group of at least two organic light emitting diodes is designed to emit light of different colors. [0002] Organic light-emitting diodes (OLEDs) are a promising technology for display and lighting applications. Especially for lighting applications, medium to large area organic light-emitting diodes or devices based on such diodes are required. The production of medium-to-large-area organic light-emitting diodes, especially layered structures comprising organic materials, is usually carried out by using thermal evaporation in vacuum on a light-transmissiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L27/32H01L51/52
CPCH01L51/5275H01L51/5268H01L27/3211H01L51/5265H10K59/35H10K59/879H10K59/877H10K59/876H10K50/11H10K50/13H10K50/852H10K50/854H10K50/858
Inventor G.F.格尔特纳H-P.勒布尔
Owner BEIJING XIAOMI MOBILE SOFTWARE CO LTD
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