Multifunctional guanidinium thiocyanate additive to enhance the performance of quasi-two-dimensional perovskite blue-emitting devices. Issue 1 (1st January 2023)

• Record Type: Journal Article
• Authors: Gao, Jiulin; Peng, Xuefeng; Qin, Chaochao; Wang, Zongpu; Yang, Xiaohui
• Is Part Of: Ceramics international. Volume 49:Issue 1(2023)
• Page Start: 1308
• Page End: 1316
• Publication Date: 2023-01-01
• Subjects: Quasi-two-dimensional perovskite -- Blue-emitting device -- Guanidinium thiocyanate -- Phase distribution -- Charge transport; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2022.09.111
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Phase distribution, defect density, and charge transport of quasi-two-dimensional perovskites are the important factors determining the performance of the related light-emitting devices. Herein, the effects of the guanidinium thiocyanate (GaSCN) addition on the photo-physical, crystallographical, morphological, charge transport, and electroluminescent properties of the quasi-two-dimensional perovskites were studied. SCN − adjusted the phase distribution by increasing the n = 2 phase content and decreasing the n = 3 and n = 4 phase contents, which facilitated the charge funneling. Ga + mainly contributed to reducing the defect density. In addition, GaSCN increased the crystallinity, promoting the charge transport. Consequently, the quasi-two-dimensional perovskite blue-emitting device with GaSCN showed the maximum external quantum efficiency of 8.39%, which was 4.26 times that of the control device without GaSCN, together with the improved spectral and operational stabilities. This work highlights that the incorporation of a pseudohalide additive to simultaneously adjust the phase distribution, passivate defects, and promote the charge transport is promising for enhancing the performance of quasi-two-dimensional perovskite blue-emitting devices.