Flexible White Light Emitting Diodes Based on Nitride Nanowires and Nanophosphors
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- 作者：Nan Guan ; Xing Dai ; Agnès Messanvi ; Hezhi Zhang ; Jianchang Yan ; Eric Gautier ; Catherine Bougerol ; François H. Julien ; Christophe Durand ; Joël Eymery ; Maria Tchernycheva
- 刊名：ACS Photonics
- 出版年：2016
- 出版时间：April 20, 2016
- 年：2016
- 卷：3
- 期：4
- 页码：597-603
- 全文大小：548K
- 年卷期：0
- ISSN：2330-4022
文摘
We report the first demonstration of flexible white phosphor-converted light emitting diodes (LEDs) based on p–n junction core/shell nitride nanowires. GaN nanowires containing seven radial In0.2Ga0.8N/GaN quantum wells were grown by metal–organic chemical vapor deposition on a sapphire substrate by a catalyst-free approach. To fabricate the flexible LED, the nanowires are embedded into a phosphor-doped polymer matrix, peeled off from the growth substrate, and contacted using a flexible and transparent silver nanowire mesh. The electroluminescence of a flexible device presents a cool-white color with a spectral distribution covering a broad spectral range from 400 to 700 nm. Mechanical bending stress down to a curvature radius of 5 mm does not yield any degradation of the LED performance. The maximal measured external quantum efficiency of the white LED is 9.3%, and the wall plug efficiency is 2.4%.