Polarization-selective three-photon absorption and subsequent photoluminescence in CsPbBr3 single crystal at room temperature
Polarization-selective three-photon absorption and subsequent photoluminescence in CsPbBr3 single crystal at room temperature
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DOI：
10.1103/physrevb.93.195202
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发表时间：
2016-05-05
影响因子：
3.7
通讯作者：
Jang, J. I.
中科院分区：
文献类型：
--
作者：
Clark, D. J.;Stoumpos, C. C.;Jang, J. I.
我们报告了在Bridgman生长的CsPbBr 3单晶中沿着（112）方向取向的高度偏振选择性三光子吸收（3 PA），这是新兴的有机-无机混合卤化物钙钛矿太阳能电池和光电应用的无机对应物。该晶体在室温下表现出强烈的光致发光（PL）作为3 PA的基本辐射的直接结果。有趣的是，当输入偏振方向平行于（-110）方向时，3 PA消失。当与（-110）正交时，该3 PA效应最强，并且在λ = 1200 nm的基波波长下的皮秒脉冲激发下，测量到相应的3 PA系数为γ = 0.14 +/- 0.03 cm（3）/GW（2）。在相同波长下，激光损伤阈值约为20 GW/cm（2）。基于相对PL强度。在整个3 PA范围（1100-1700 nm）上调谐，我们确定了CsPbBr 3的3 PA系数的非线性光学色散，这与理论预测一致。实验观察到显着的偏振依赖性。相关评选规则对此进行了解释。钙钛矿是潜在的重要的非线性光学应用，由于其高效的3 PA诱导的PL响应与尖锐的开/关比通过主动偏振控制。
We report on highly polarization-selective three-photon absorption (3PA) in a Bridgman-grown single crystal of CsPbBr3 oriented along the (112) direction, which is an inorganic counterpart to emerging organic-inorganic hybrid halide perovskites for solar-cell and optoelectronic applications. The crystal exhibits strong photoluminescence (PL) at room temperature as a direct consequence of 3PA of fundamental radiation. Interestingly, 3PA disappears when the input polarization is parallel to the (-110) direction. This 3PA effect is strongest when orthogonal to (-110) and the corresponding 3PA coefficient was measured to be gamma = 0.14 +/- 0.03 cm(3)/GW(2) under picosecond-pulse excitation at the fundamental wavelength of lambda = 1200 nm. The laser-induced damage threshold was also determined to be about 20 GW/cm(2) at the same wavelength. Based on relative PL intensities upon. tuning over the entire 3PA range (1100-1700 nm), we determined the nonlinear optical dispersion of the 3PA coefficient for CsPbBr3, which is consistent with a theoretical prediction. Experimentally observed significant polarization dependence of. was explained by relevant selection rules. The perovskite is potentially important for nonlinear optical applications owing to its highly efficient 3PA-induced PL response with a sharp on/off ratio by active polarization control.