Yang Mingxue, Zhao Tian-Xiang, Ji Si-Chao, Tao Xiao-Dong, Chen Xu-Lin, Meng Lingyi, Liang Dong, Lu Can-Zhong
CAS Key Laboratory of Design and Assembly of Functional Nanostructures, and Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou 350002, China.
Xiamen Institute of Rare Earth Materials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Xiamen 361021, China.
Nanomaterials (Basel). 2022 Jul 7;12(14):2333. doi: 10.3390/nano12142333.
Organic light-emitting diodes (OLEDs) with tunable emission colors, especially white OLEDs, have rarely been observed with a single emitter in a single emissive layer. In this paper, we report a new compound featuring a D-A-D structure, 9,9'-(pyrimidine-2,5-diylbis(2,1-phenylene))bis(3,6-di-tert-butyl-9-carbazole) (). A nondoped OLED using this compound as a single emitter exhibits unique voltage-dependent dual emission. The emission colors range from blue to orange-red with an increase in voltage, during which white electroluminescence with a (CIE) coordinate of (0.35, 0.29) and a color render index (CRI) value of 93 was observed. A comparative study revealed that the dual emission simultaneously originates from the monomers and excimers of the emitter. This study provides insight into understanding the multimer-excited mechanism and developing novel color-tunable OLEDs.
具有可调发射颜色的有机发光二极管（OLED），尤其是白色OLED，很少在单个发射层中使用单一发射体被观察到。在本文中，我们报道了一种具有D-A-D结构的新型化合物，9,9'-(嘧啶-2,5-二基双(2,1-亚苯基))双(3,6-二叔丁基-9-咔唑)（）。使用该化合物作为单一发射体的非掺杂OLED表现出独特的电压依赖性双发射。随着电压增加，发射颜色从蓝色变化到橙红色，在此期间观察到了CIE坐标为(0.35, 0.29)且显色指数（CRI）值为93的白色电致发光。一项对比研究表明，双发射同时源自发射体的单体和准分子。这项研究为理解多聚体激发机制和开发新型颜色可调OLED提供了见解。
