Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites

$Crystal structures of perovskite materials. (a) XRD patterns; (b) enlarged version of the (100) diffraction peak region; (c) substitution of MA+ in the MAPbBr3 core by EA+; (d) tolerance factor of MAxEA(1-x)PbBr3 as a function of the MA+ proportion$

Fig. 2. Crystal structures of perovskite materials. (a) XRD patterns; (b) enlarged version of the (100) diffraction peak region; (c) substitution of MA⁺ in the MAPbBr₃ core by EA⁺; (d) tolerance factor of MA_xEA_(1-_x₎PbBr₃ as a function of the MA⁺ proportion

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Fig. 3. Morphologies of perovskite samples (intest show high-resolution SEM images). (a) MAPbBr₃, top-view; (b) 5∶1 sample, top-view; (c) 2∶1 sample, top-view; (d) 1∶2 sample, top-view; (e) cross-sectional SEM image of the 2∶1 sample

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Fig. 4. Photo-physics properties of the perovskite samples. (a) UV-vis absorption spectra; (b) steady-state PL spectra, insets show the images of the 2∶1 sample under white (left) and UV light (right); the MAPbBr₃ and 2∶1 samples for (c) UPS spectra, (d) time-resolved luminescence decay curves, (e) I-V characteristics of hole-dominated devices, and (f) photo-stability measurements

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Fig. 5. Properties of light-emitting devices. (a) J-L-V characteristics; (b) EQE-voltage curves; (c) power efficiency-voltage plots; (d) EL spectra, inset is a photo of 2 ∶1 device; (e) operational stability measurements of the MAPbBr₃ and 2∶1 devices

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Table 1. Fitting parameters of the time-resolved luminescence decay characteristics of the samples
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Table 1. Fitting parameters of the time-resolved luminescence decay characteristics of the samples
Samples ${τ_{1}}_{}$ /ns ${A_{1}}_{}$ /% ${τ_{2}}_{}$ /ns ${A_{2}}_{}$ /% ${τ_{ave}}_{}$ /ns
MAPbBr₃ 9.30 88.98 39.97 11.02 12.68
2∶1 17.31 81.68 87.68 18.32 30.20

Table 2. Detailed properties of light-emitting devices

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Table 2. Detailed properties of light-emitting devices

Device	EQE /%	LE /(cd·A^-1)	PE /(lm·W^-1)	Luminane /(cd·m^-2)	CIE coordinates
MAPbBr₃	4.1	16.2	14.5	15440	(0.222, 0.720)
5∶1	4.6	16.9	13.6	14980	(0.180, 0.761)
2∶1	7.7	28.8	25.1	11960	(0.175, 0.768)
1∶2	4.3	12.2	11.6	2910	(0.108, 0.749)

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Xiaohui Yang, Qi Wang, Zewu Xiao, Xiaoyan Wu, Jie Ren, Yanting Wu. Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites[J]. Acta Optica Sinica, 2019, 39(10): 1016002

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