Calix[4]resorcinarene-based hyper-structured molecular thermally activated delayed fluorescence yellow-green emitters for non-doped OLEDs

Fanfan Wang; Weidong Qiu; Jin Zeng; Peng Yuan; Wansheng Zong; Wenbo Wu; Yingliang Liu; Shengang Xu; Shi-Jian Su; Shaokui Cao

doi:10.1039/C9TC05817F

Calix[4]resorcinarene-based hyper-structured molecular thermally activated delayed fluorescence yellow-green emitters for non-doped OLEDs†

Fanfan Wang,‡^a Weidong Qiu,‡^b Jin Zeng,^a Peng Yuan,^a Wansheng Zong,

^a Wenbo Wu,

^a Yingliang Liu,

^a Shengang Xu,

*^a Shi-Jian Su

*^b and Shaokui Cao

*^a

Author affiliations

* Corresponding authors

^a Henan Key Laboratory of Advanced Nylon Materials and Application, School of Materials Science and Engineering, Zhengzhou University, Zhengzhou, China
E-mail: xusg@zzu.edu.cn, caoshaokui@zzu.edu.cn

^b State Key Laboratory of Luminescent Materials and Devices and Institute of Polymer Optoelectronic Materials and Devices, South China University of Technology, Guangzhou, China
E-mail: mssjsu@scut.edu.cn

Abstract

A series of novel hyper-structured molecular (HSM) thermally activated delayed fluorescent (TADF) emitters, in which the TADF units and host units are bound together into one inactive core through flexible linkages, were designed. Phenoxazine-triphenyltriazine (PXZ-Trz), 1,3-bis(9H-carbazol-9-yl)benzene (mCP) and calix[4]resorcinarene (CRA) were chosen as the TADF unit, the host unit and the core, respectively. A series of CRA-based HSM emitters, CRA-PXZ-Trz_(X)-mCP_(100−X) (X = 0, 12.5, 25, 50, 75, 87.5 or 100) were successfully synthesized by a two-step click reaction. Upon using non-doped CRA-PXZ-Trz_(87.5)-mCP_(12.5) as the light-emitting layer, the solution-processable OLEDs emitted yellow-green light, and displayed an external quantum efficiency of 16.7% at 100 cd m⁻².

Journal of Materials Chemistry C

Calix[4]resorcinarene-based hyper-structured molecular thermally activated delayed fluorescence yellow-green emitters for non-doped OLEDs†

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Calix[4]resorcinarene-based hyper-structured molecular thermally activated delayed fluorescence yellow-green emitters for non-doped OLEDs

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