封面文章 | An efficient Ir(III) complex for OLEDs and F− ion sensors
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▲ Issue 3, Vol 3 | Front Cover
Research Article
High performance solution-processed organic yellow light-emitting devices and fluoride ion sensors based on a versatile phosphorescent Ir(III) complex
Authors
Xiaolong Yang, Zhao Feng, Jingshuang Dang, Yuanhui Sun, Guijiang Zhou*a and Wai-Yeung Wong*b
Corresponding authors affiliation
a) 化学与化学工程系, 西安交通大学
b) 应用生物与化学技术系，香港理工大学
Citation
Mater. Chem. Front., 2019,3, 376-384
http://dx.doi.org/10.1039/C8QM00548F
Abstract
An efficient phosphorescent iridium(III) complex (BPyPmIr) has been prepared with the asymmetric structure of (C^N1)(C^N2)Ir(acac) in which C^N1 and C^N2 are 5-(dimesitylboranyl)-2-phenylpyridine and 2-(2,4-difluorophenyl)pyrimidine, respectively, and acac is acetylacetonate. At room temperature, BPyPmIr shows a very high photoluminescence quantum yield (PLQY) of 0.88 in THF and nearly unity in doped films. A solution-processed yellow OLED based on BPyPmIr gives the maximum luminance (Lmax), external quantum yield (EQE), current efficiency (CE), and power efficiency (PE) of 54 378 cd m−2, 18.7%, 62.8 cd A−1, and 60.9 lm W−1, respectively, with very low efficiency roll-off at a high luminance of 1000 cd m−2, which are among the highest efficiencies ever reported for solution-processed yellow OLEDs. Furthermore, because of the strong boron–fluoride ion interactions between the dimesitylboryl moiety and F− ions, this Ir(III) complex can be used as an efficient “color-switch” sensor for detecting F− ions. Besides its high sensitivity and selectivity, the detection limit of this Ir(III) complex is as low as 1.55 × 10−7 M.
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