光学学报, 2019, 39 (10): 1016002, 网络出版: 2019-10-09
混合阳离子钙钛矿的高效率绿色发光器件 
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Highly Efficient Green-Emitting Devices Based on Mixed-Cation Perovskites
图 & 表
图 1. 发光器件结构与能级图。(a)结构图;(b)能级图
Fig. 1. Configuration and energy level diagram of light-emitting devices. (a) Configuration; (b) energy level
图 2. 钙钛矿材料的晶体结构。(a) XRD图谱;(b) (100)衍射峰的放大图谱;(c) EA+离子取代MAPbBr3晶格中的MA+离子;(d) MAx EA(1-x )PbBr3的容忍因子
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 MAx EA(1-x )PbBr3 as a function of the MA+ proportion
图 3. 钙钛矿样品的形貌(插图为高分辨率SEM图像)。(a) MAPbBr3,正面;(b) 5∶1样品,正面;(c) 2∶1样品,正面;(d) 1∶2样品,正面;(e) 2∶1样品的截面SEM图像
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
图 4. 钙钛矿材料的光物理特性。(a) UV-vis吸收光谱;(b)稳态PL光谱,插图为2∶1样品在白光和紫外光下的照片;MAPbBr3和 2∶1样品的(c)紫外光电子能谱图,(d)时间分辨发光衰减曲线,(e)空穴主导型器件的电流-电压特性,(f)光稳定性
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
图 5. 发光器件的特性。(a)J-L-V 特性;(b)外量子效率-电压特性;(c)功率效率-电压特性;(d)电致发光光谱,插图为2∶1器件发光的照片;(e) MAPbBr3和2∶1器件的驱动稳定性
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
表 1时间分辨光致发光衰减特性的拟合参数
Table1. Fitting parameters of the time-resolved luminescence decay characteristics of the samples
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表 2发光器件特性
Table2. Detailed properties of light-emitting devices
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杨晓晖, 王琦, 肖择武, 吴小龑, 任杰, 吴燕婷. 混合阳离子钙钛矿的高效率绿色发光器件[J]. 光学学报, 2019, 39(10): 1016002. 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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