基于FAPbBr3钙钛矿纳米晶体的非线性吸收和低阈值双光子泵浦放大自发辐射
Nonlinear Absorption and Low-threshold Two-photon Pumped Amplified Stimulated Emission from FAPbBr3 Nanocrystals
王亚娟 1TAY Yong Kang Eugene 2王芳 1余盛 1岑子健 2刘威3
作者信息
- 1. 宁波工程学院材料与化学工程学院,浙江宁波 315211
- 2. 南洋理工大学物理与数学科学学院,新加坡 637371
- 3. 浙江农林大学光机电工程学院,浙江杭州 311300
- 折叠
摘要
甲脒铅溴(FAPbBr3)钙钛矿纳米晶因其更标准的绿光发射、优异的稳定性和载流子传输特性而被认为是一种良好的光电材料.然而,FAPbBr3纳米晶体的双光子泵浦放大自发辐射(ASE)和相应的非线性光学特性却很少被报道.本文在室温下通过改变前驱体溶液中FABr/PbBr2的摩尔配比,利用配体辅助沉淀(LARP)技术合成了不同尺寸的胶体FAPbBr3纳米晶体.测量了光致发光(PL)和时间分辨光致发光光谱(TRPL),以表征其ASE特性.并利用Z扫描技术和双光子激发荧光方法研究了它们的非线性光学特性.实现了FAPbBr3纳米晶的单光子和双光子泵浦放大自发辐射,阈值分别低至9.8μJ/cm2和487μJ/cm2,具有大的双光子吸收系数(0.27 cm/GW)和高的非线性吸收截面(7.52×105 GM).这些结果表明,作为一种新的有前景的低阈值绿光发射频率上转换材料,FAPbBr3纳米晶在开发高性能双光子泵浦激光器方面具有巨大的潜力.
Abstract
Formamidinium lead bromide (FAPbBr3) nanocrystals (NCs) have been considered to be a good opto-electronic material due to their pure green emission,excellent stability and superior carrier transport characteristics.However,two-photon pumped amplified spontaneous emission (ASE) and the corresponding nonlinear optical prop-erties of FAPbBr3 NCs are scarcely revealed.Herein,we synthesized colloidal FAPbBr3 NCs with different sizes by changing the molar ratio of FABr/PbBr2 in the precursor solution,using ligand assisted precipitation (LARP) technol-ogy at room temperature.Photoluminescence (PL) and time resolved photoluminescence (TRPL) spectroscopy were measured to characterize their ASE properties.And their nonlinear optical properties were studied through the Z-scan technique and the two-photon excited fluorescence method.The stimulated emission properties including one-and two-photon pumped ASE have been realized from FAPbBr3 NCs.With large two-photon absorption coefficient (0.27 cm/GW) and high non-linear absorption cross-section (7.52×105 GM),ASE with threshold as low as 9.8 μJ/cm2 and 487 μJ/cm2 have been obtained from colloidal FAPbBr3 NCs using one-and two-photon excitations.These re-sults indicate that as a new possible green-emitting frequency-upconversion material with low thresholds,FAPbBr3 NCs hold great potential in the development of high-performance two-photon pump lasers.
关键词
钙钛矿/FAPbBr3纳米晶/非线性/光增益/放大自发辐射Key words
perovskites/formamidinium lead bromide nanocrystals/nonlinear/optical gain/amplified spontaneous emission引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据