High-Energy-Level Blue Phosphor for Solution-Processed White Organic Light-Emitting Diodes with Efficiency Comparable to Fluorescent Tubes.
High-Energy-Level Blue Phosphor for Solution-Processed White Organic Light-Emitting Diodes with Efficiency Comparable to Fluorescent Tubes.
复制标题
用于溶液加工白色有机发光二极管的高能级蓝色荧光粉，其效率可与荧光灯管相媲美
DOI：
10.1016/j.isci.2018.07.016
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发表时间：
2018-08-31
期刊：
影响因子：
5.8
通讯作者：
Wong WY
中科院分区：
文献类型：
--
作者：
Wang S;Zhao L;Zhang B;Ding J;Xie Z;Wang L;Wong WY
研制了一种用于溶液法制备的白色有机电致发光器件（WOLED）的高能级蓝色荧光粉FIr-p-OC 8。受益于引入的烷氧基的供电子性质，FIr-p-OC 8不仅显示出高效的蓝光，而且还显示出升高的最高占据分子轨道/最低未占据分子轨道水平，以很好地匹配树枝状主体H2。因此，可以防止FIr-p-OC 8和H2之间的空穴散射，以有利于在蓝色荧光体上直接形成激子，导致驱动电压降低，从而提高功率效率。通过利用这种方法，基于FIr-p-OC 8的白色器件的最大功率效率为68.5 lm W−1，在实际亮度为1，000 cd m−2时略微下降至47.0 lm W−1。当采用半球形来增加光耦合输出时，该效率可以进一步提高到96.3 lm W− 1@1，000 cd m−2。我们相信我们的结果可以与商业荧光灯管竞争，代表了溶液处理WOLED的重要进展。高能级蓝色荧光粉FIr-p-OC 8是通过烷氧基取代开发的树枝状主体和蓝色发光掺杂剂之间的HOMO能级匹配无空穴散射，以促进蓝色荧光粉上的直接激子形成记录-溶液处理WOLED在1，000 cd m−2时的高功率效率为96. 3 lm W−1有机化学;无机材料;光电子
A high-energy-level blue phosphor FIr-p-OC8 has been developed for solution-processed white organic light-emitting diodes (WOLEDs) with comparable fluorescent tube efficiency. Benefiting from the electron-donating nature of the introduced alkoxy, FIr-p-OC8 shows not only efficient blue light but also elevated highest occupied molecular orbital/lowest unoccupied molecular orbital levels to well match the dendritic host H2. Consequently, the hole scattering between FIr-p-OC8 and H2 can be prevented to favor the direct exciton formation on the blue phosphor, leading to reduced driving voltage and thus improved power efficiency. By exploiting this approach, a maximum power efficiency of 68.5 lm W−1 is achieved for FIr-p-OC8-based white devices, slightly declining to 47.0 lm W−1 at a practical luminance of 1,000 cd m−2. This efficiency can be further raised to 96.3 lm W−1 @ 1,000 cd m−2 when a half-sphere is applied to increase light out-coupling. We believe that our results can compete with commercial fluorescent tubes, representing an important progress in solution-processed WOLEDs. High-energy-level blue phosphor FIr-p-OC8 is developed by alkoxyl substitution Matched HOMO levels between dendritic host and blue-emitting dopant Free of hole scattering to promote direct exciton formation on blue phosphor Record-high power efficiency of 96.3 lm W−1 at 1,000 cd m−2 for solution-processed WOLEDs Organometallic Chemistry; Inorganic Materials; Optoelectronics
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