Fig. 12
From: Perovskite single-crystal thin films: preparation, surface engineering, and application
PVK SCTFs for light-emitting devices. a Schematic of the growth of MAPbBr3 SCTFs. b Optical image and height profile of the MAPbBr3 SCTF. c Diagram of exciton–photon interaction in the DBR laser. d PL spectrum of the microcavity structure measured as a function of the pump fluence. Inset shows the dark-field image of the lasing emission. Reproduced with permission from Ref. [115]. Copyright 2019, Elsevier. e Schematic of the nucleation process of CsPbBr3 SCTFs on a c-plane sapphire substrate. f Optical images of CsPbBr3 SCTFs. Inset shows the AFM image and height profile of the CsPbBr3 SCTF. g Power-dependent PL of the CsPbBr3 microdisk with increasing pump fluence (from 0.4 to 6 µJ cm− 2). h Pump-fluence-dependent PL intensity and FWHM of the CsPbBr3 microdisk. Inset shows the PL image of the microdisk below and above the threshold (scale bar is 15 μm). Reproduced with permission from Ref. [116]. Copyright 2020, American Chemical Society. i Schematic of the LIB method and device architecture of LED. j L–V–J curve of the brightest device. k CE and EQE data of the brightest device as a function of voltage. l CIE diagram of the brightest device. m CE versus the luminance curve of the device. Inset shows the EL image of the device. Reproduced with permission from Ref. [119]. Copyright 2022, American Chemical Society