High performance solution-processed yellow organic light-emitting device and fluoride ion sensor based on a versatile phosphorescent Ir(III) complex
High performance solution-processed yellow organic light-emitting device and fluoride ion sensor based on a versatile phosphorescent Ir(III) complex
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基于多功能磷光 Ir(III) 络合物的高性能溶液处理黄色有机发光器件和氟离子传感器
DOI：
10.1039/c8qm00548f
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发表时间：
2019
影响因子：
7
通讯作者：
Wai-Yeung Wong
中科院分区：
文献类型：
--
作者：
Xiaolong Yang;Zhao Feng;Jingshuang Dang;Yuanhui Sun;Guijiang Zhou;Wai-Yeung Wong
合成了一种高效磷光铱配合物（BPyPmIr），具有不对称结构（C^N1）（C^N2）Ir（acac），其中C^N1和C^N2分别为5-（2，4-二氟苯基）-2-苯基吡啶和2-（2，4-二氟苯基）嘧啶，acac为乙酰丙酮。在室温下，BPyPmIr在THF中显示出非常高的光致发光量子产率（PLQY）为0.88，在掺杂薄膜中几乎为1。基于BPyPmIr的溶液处理的黄色OLED给出的最大亮度（Lmax）、外量子产率（EQE）、电流效率（CE）和功率效率（PE）分别为54 378 cd m-2、18.7%、62.8 cd A-1和60.9 lm W-1，在1000 cd m-2的高亮度下具有非常低的效率衰减，这是溶液处理的黄色OLED所报道的最高效率之一。此外，由于二均三甲苯基硼基部分与F−离子之间的强硼-氟离子相互作用，这种Ir（III）络合物可以用作检测F−离子的有效“颜色开关”传感器。除了高灵敏度和高选择性外，这种Ir（III）配合物的检测限低至1.55 × 10−7 M。
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.