Flexible White Light Emitting Diodes Based on Nitride Nanowires and Nanophosphors.
Flexible White Light Emitting Diodes Based on Nitride Nanowires and Nanophosphors.
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DOI：
10.1021/acsphotonics.5b00696
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发表时间：
2016-04-20
期刊：
影响因子：
7
通讯作者：
Tchernycheva M
中科院分区：
文献类型：
--
作者：
Guan N;Dai X;Messanvi A;Zhang H;Yan J;Gautier E;Bougerol C;Julien FH;Durand C;Eymery J;Tchernycheva M
我们报告的第一个演示柔性白色磷光体转换发光二极管（LED）的p-n结核/壳氮化物纳米线的基础上。采用无催化剂的方法，在蓝宝石衬底上用金属有机物化学气相沉积法生长了含有七个径向In0.2Ga0.8N/GaN量子威尔斯阱的GaN纳米线。为了制造柔性LED，将纳米线嵌入到磷光体掺杂的聚合物基质中，从生长衬底剥离，并使用柔性和透明的银纳米线网进行接触。柔性器件的电致发光呈现冷白色，其光谱分布覆盖400至700 nm的宽光谱范围。低至5 mm曲率半径的机械弯曲应力不会导致LED性能的任何劣化。测得的白色LED的最大外量子效率为9.3%，壁插效率为2.4%。
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%.