Improved phase purity and film quality in quasi-2D perovskite light-emitting diodes by an additive with the trimethacrylate group

Xiaofeng Huang; Wu Liu; Wei Wang; Yao Lu; Jie Dong; Yueqiao Li; Dong Wei; Bo Qiao; Suling Zhao; Zheng Xu; Dandan Song

doi:10.1039/d1ra09040b

Improved phase purity and film quality in quasi-2D perovskite light-emitting diodes by an additive with the trimethacrylate group

RSC Adv. 2022 Jan 24;12(5):3081-3089. doi: 10.1039/d1ra09040b. eCollection 2022 Jan 18.

Authors

Xiaofeng Huang^{1

2}, Wu Liu^{1

2}, Wei Wang^{1

2}, Yao Lu^{1

2}, Jie Dong^{1

2}, Yueqiao Li^{1

2}, Dong Wei³, Bo Qiao^{1

2}, Suling Zhao^{1

2}, Zheng Xu^{1

2}, Dandan Song^{1

2}

Affiliations

¹ Key Laboratory of Luminescence and Optical Information, Beijing Jiaotong University, Ministry of Education Beijing 100044 China ddsong@bjtu.edu.cn.
² Institute of Optoelectronics Technology, Beijing Jiaotong University Beijing 100044 China.
³ College of Physics and Energy, Fujian Normal University Fuzhou 350117 China.

Abstract

Quasi-2D perovskites are potential materials for optoelectronics like light-emitting diodes (LEDs); compared to their 3D counterparts, they are considered more stable against the atmosphere and more efficient in exciton confining. However, the simultaneous formation of different phases in the quasi-2D perovskite film, i.e., the phase impurity issue, lowers the device performance. We propose using a small molecule additive, trimethylolpropane trimethacrylate (TMPTA), to suppress the phase impurity by mixing it into the antisolvent. The phase pure quasi-2D perovskite film was obtained, and meanwhile, the film quality was also improved. Moreover, the ester functional groups in TMPTA also passivate the charged defects in the perovskite film, minimizing the carrier recombination in the device. Correspondingly, with TMPTA modification, the maximum current efficiency is increased by 25%, and the half lifetime of the PeLEDs is prolonged by three times.