Two-Photon Up-Conversion Photoluminescence Realized through Spatially Extended Gap States in Quasi-2D Perovskite Films

被引：24
作者：
Zhu, Xixiang [1 ,2 ]
Xu, Hengxing [1 ]
Liu, Yongtao [1 ,3 ]
Zhang, Jia [1 ]
Wang, Miaosheng [1 ]
Ivanov, Ilia N. [3 ]
Ovchinnikova, Olga S. [3 ]
Hu, Bin [1 ]
机构：
[1] Univ Tennessee, Dept Mat Sci & Engn, Knoxville, TN 37996 USA
[2] Beijing Jiaotong Univ, Key Lab Luminescence & Opt Informat, Minist Educ, Beijing 100044, Peoples R China
[3] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN 37831 USA
来源：
ADVANCED MATERIALS | 2019年 / 31卷 / 49期
基金：
美国国家科学基金会;
关键词：
gap states; quasi-2D perovskites; spatially extended states; two-photon absorption; up-conversion photoluminescence; PHOTOVOLTAIC ACTIONS; SOLAR-CELLS; SPIN; DISSOCIATION;
D O I：
10.1002/adma.201901240
中图分类号：
O6 [化学];
学科分类号：
0703 ;
摘要：
A new approach to generate a two-photon up-conversion photoluminescence (PL) by directly exciting the gap states with continuous-wave (CW) infrared photoexcitation in solution-processing quasi-2D perovskite films [(PEA)(2)(MA)(4)Pb5Br16 with n = 5] is reported. Specifically, a visible PL peaked at 520 nm is observed with the quadratic power dependence by exciting the gap states with CW 980 nm laser excitation, indicating a two-photon up-conversion PL occurring in quasi-2D perovskite films. Decreasing the gap states by reducing the n value leads to a dramatic decrease in the two-photon up-conversion PL signal. This confirms that the gap states are indeed responsible for generating the two-photon up-conversion PL in quasi-2D perovskites. Furthermore, mechanical scratching indicates that the different-n-value nanoplates are essentially uniformly formed in the quasi-2D perovskite films toward generating multi-photon up-conversion light emission. More importantly, the two-photon up-conversion PL is found to be sensitive to an external magnetic field, indicating that the gap states are essentially formed as spatially extended states ready for multi-photon excitation. Polarization-dependent up-conversion PL studies reveal that the gap states experience the orbit-orbit interaction through Coulomb polarization to form spatially extended states toward developing multi-photon up-conversion light emission in quasi-2D perovskites.
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页数：8
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