期刊
ADVANCED FUNCTIONAL MATERIALS
卷 30, 期 16, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.201910633
关键词
external quantum efficiency; high efficiency; pure hydrocarbon hosts; single-triplet exciton management; white organic light-emitting diodes
类别
资金
- National Key R&D Program of China [2016YFB0400700]
- National Natural Science Foundation of China [51773141, 51873139, 21572152]
- Natural Science Foundation of Jiangsu Province of China [BK20181442]
- Collaborative Innovation Center of Suzhou Nano Science Technology
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- 111 Project of The State Administration of Foreign Experts Affairs of China
White organic light-emitting diodes (WOLEDs) composed of conventional fluorophores possess color purity, low efficiency roll-off, and rare metal absence, but suffer from theoretical limits due to the lack of triplet utilization. Due to the different diffusion distance for singlets and triplets, multiple Forster resonance energy transfer (FRET) channels can be adequately built up. Herein, besides the complementary component, a blue fluorescence layer, hosted by pure hydrocarbon material SF4-TPE, is put forward as the spatial exciton manipulating layer to rationally allocate singlets and triplets to the corresponding channels. Hence, singlets are captured by the blue fluorophore, diffused triplets subsequently undergo energy resonance between the blue fluorophore and green assistant, and up-conversion effect for eventual emission from the yellow fluorophore. Owing to the utilization of singlets and triplets, all-fluorescence WOLEDs exhibit high efficiency exceeding 20%, with slight efficiency roll-off even under high luminance of 5000 cd cm(-2). Moreover, CIE coordinates can be surrounding and precisely inside the American National Standard Institute (ANSI) quadrangles, as well as outstanding color stability (Delta CIE-(x, y) within (0.001, 0.012)) from 300 to 13000 cd cm(-2).
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