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Manipulation and exploitation of singlet and triplet excitons for hybrid white organic light-emitting diodes with superior efficiency/CRI/color stability

Abstract

High performing tetra-chromatic hybrid white organic light-emitting diode (WOLED), with a fluorescent blue emitting layer (EML) of Bis[2-(2-hydroxyphenyl) -pyridine]beryllium (Bepp2) sandwiched between a pair of phosphors-doped hole transporting layer (HTL) and electron transporting layer (ETL), was developed. This was achieved by controlling the location of the green phosphor doped in HTL and yellow phosphor doped in ETL at 1 nm away from the HTL/EML and EML/ETL interfaces, and incorporating an ultrathin red phosphorescence layer (< 0.1 nm) in the center of Bepp2 EML. The resulting hybrid WOLED realizes good warm white emission, showing stable electroluminescence spectra with a maximum color rendering index (CRI) of 94 and a low correlated color temperature of 2440−2468 K over a wide voltage range from 5−9 V. Meanwhile, this WOLED also achieves high device efficiency, the maximum current efficiency, power efficiency, and external quantum efficiency up to 34.15 cd/A, 29.51 lm/W, and 17.71 %, respectively. Such high performance is realized through the precise manipulation and effective exploitation of singlet and triplet excitons via novel device design. Moreover, the proposed WOLED also removes the additional interlayers between the fluorescent and phosphorescent emitting regions that are commonly employed in the conventional hybrid WOLEDs, inducing a simplified device structure with reduced heterojunction interfaces, which is very beneficial for promoting the commercial development of WOLEDs.

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Publication details

The article was received on 05 Oct 2017, accepted on 08 Nov 2017 and first published on 10 Nov 2017


Article type: Paper
DOI: 10.1039/C7TC04528J
Citation: J. Mater. Chem. C, 2017, Accepted Manuscript
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    Manipulation and exploitation of singlet and triplet excitons for hybrid white organic light-emitting diodes with superior efficiency/CRI/color stability

    Y. Miao, K. Wang, B. Zhao, L. Gao, Y. Wang, H. Wang, B. Xu and F. Zhu, J. Mater. Chem. C, 2017, Accepted Manuscript , DOI: 10.1039/C7TC04528J

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