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LED microcavity structure suitable for special lighting

A microcavity and special technology, applied in the direction of electrical components, circuits, semiconductor devices, etc., can solve the problems of lack of electroluminescent components, obstacles to the balance of the performance of multi-color quantum dots, and the impact on the development of quantum dot LED technology, etc., to achieve Effects of prolonging radiation lifetime, improving conversion efficiency, and prolonging radiation recombination lifetime

Active Publication Date: 2013-04-03
DONGYING CITY JIAWEN OPTOELECTRONICS
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Problems solved by technology

First, the efficiency of QD phosphors based on white LEDs is much lower than the theoretically expected improvement (about 53%) due to the difficulty in controlling the QD-QW non-radiative energy conversion.
Secondly, in order to obtain the output light with the expected color characteristics, the performance mismatch among the multi-color quantum dots in LED is an obstacle to the balance of the emission color of multi-color quantum dots
The lack of bright, saturated blue electroluminescent components has seriously affected the development of quantum dot LED technology.

Method used

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  • LED microcavity structure suitable for special lighting
  • LED microcavity structure suitable for special lighting
  • LED microcavity structure suitable for special lighting

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Embodiment Construction

[0031] Such as Figure 3a , Figure 3b and Figure 3c As shown, the non-resonant microcavity is sequentially composed of a broadband metal mirror (Ag) 1, an upper spacer layer of SiN 2, a QD-QW emitter 3, a lower spacer layer of GaN 4 and SiO 2 / TiO 2 The narrow-band dielectric reflection film 5 is composed of a QD-QW luminous body 3 which consists of a QD layer 6, a GaN barrier layer 7 and an InGaN / GaN quantum well layer 8 from top to bottom, which can be used as a one-dimensional PBG crystal to change the optical mode in the cavity Density, which significantly prolongs the radiative recombination lifetime of electron-holes in quantum wells, thereby enhancing the transfer of non-radiative energy from the blue-emitting quantum well layer (QW) to the red, yellow, and green-emitting QD layers. The blue light emission from the QWs will be reduced due to the energy transfer from the QWs to the QDs due to the enhancement of the microcavity, which can also be clearly demon...

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Abstract

The invention relates to an LED micorcavity structure, in particular to an LED non-resonance microcavity structure which is suitable for special lighting. A QD-QW structure is inserted into a non-resonance microcavity with a Q-factor, and the LED micorcavity structure comprises a broadband metal reflecting mirror, a QD-QW illuminant, spacer layers and a distributed bragg reflector (DBR), can change optical mode density in a cavity as a one-dimensional PBG crystal and obviously prolongs electron-hole radiation reconstructing life in quantum wells, thereby prolonging the radiation life of the illuminant; in addition, the invention improves the conversion efficiency of non-radiating energy, realizes the preset efficiency of a white light LED and is applicable to special lighting, especially practicalization in special lighting environments such as the lighting in aerospace cabins, the special lighting for human bodies-intervening medical treatment, supplementary lighting of modern agriculture, lighting for entrapment and the like.

Description

technical field [0001] The invention relates to an LED microcavity structure, in particular to an LED non-resonant microcavity structure suitable for special lighting. Background technique [0002] The existing solid-state light-emitting white light-emitting diode (LED) technology is mainly based on the use of high quantum efficiency (r≥60%) blue light InGaN quantum well structure, through the down-conversion of fluorescent materials, the blue light is downgraded to red and green, thereby three-color Mixing produces white light. However, white LEDs designed with phosphor conversion still have many performance limitations. First of all, the multi-step color down-conversion implementation has inherent efficiency limitations: the high-energy blue light photons generated by the InGaN quantum well LED must first be absorbed by the phosphor, and then assisted by impurity ion centers for one-to-one conversion into low-energy photons. wavelength photons. During this process, part...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/46
Inventor 张庆
Owner DONGYING CITY JIAWEN OPTOELECTRONICS
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