期刊
ISCIENCE
卷 6, 期 -, 页码 128-+出版社
CELL PRESS
DOI: 10.1016/j.isci.2018.07.016
关键词
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资金
- National Key Basic Research and Development Program of China (973 program) [2015CB65001]
- National Natural Science Foundation of China [91333205, 51573183, 51322308, 51473162, 51325303, 51703223]
- Hong Kong Polytechnic University [1-ZE1C]
- Areas of Excellence Scheme, University Grants Committee of HKSAR, China [AoE/P-03/08]
- Hong Kong Research Grants Council [HKBU 12304715]
- [847S]
A high-energy-level blue phosphor Flr-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, Flr-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 Flr-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 Flr-p-OC(8-)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.
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