Journal
DYES AND PIGMENTS
Volume 178, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.dyepig.2020.108354
Keywords
Organic light-emitting diodes; Electron transport material; Blue emitter; Electroluminescence
Funding
- National Natural Science Foundation of China [21771172]
- Youth Innovation Promotion Association CAS [2013150]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20000000]
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In this study, a feasible device design strategy was reported to achieve efficient blue and white fluorescent organic light-emitting diodes by exploiting a conventional electron transport material as blue emitter. A series of devices were fabricated and investigated by selecting closely matched host materials. The doped blue emitter molecules within a hole dominant light-emitting layer function as both emitting centers and electron transport ladders, thus help to broaden the recombination zone and improve the balance of the carriers. Finally, high performance blue device with the maximum brightness (B-max), external quantum efficiency (eta(ext), (max)) and Commission Internationale de l'Eclairage coordinates (CIEx, y) of 7531 cd/m(2), 4.3% and (0.146, 0.148), respectively, was obtained. Furthermore, the optimized white EL device with B-max, eta(ext), (max )and CIEx, y up to 11,315 cd/m(2), 5.7% and (0.241, 0.327), respectively, was acquired by adjusting the doping concentrations of fluorescent emitters and the thicknesses of light-emitting layers.
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