南京航空航天大学姜明明等：金属纳米结构的表面修饰用于电泵浦钙钛矿微激光器
2025-11-05 11:53:04
作者：本网发布 来源：中国科学材料
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实现更小尺寸、更紧凑结构的电泵浦激光器，对未来的光信息处理、光存储及光子集成电路发展具有重要意义。然而，由于稳定性差、高非辐射复合损耗和严重的焦耳热效应，开发电注入激光器件仍具有挑战性。
近日，南京航空航天大学姜明明教授等人在Science China Materials发表研究论文，展示了一种金纳米颗粒（AuNPs）修饰的低维钙钛矿微激光器，其在室温光泵浦与电流注入协同作用下可实现超低阈值激光输出。
本文要点
1) 在293 K时，四方相钙钛矿纳米片激光器表现出约0.4 nm μJ−1 cm2的蓝移；在80 K时，正交相钙钛矿纳米片激光器表现出约1 nm μJ−1 cm2的红移。该器件的阈值显著降至8.6 μJ/cm2，较未修饰样品降低约44%。
2) 特定尺寸的AuNPs不仅能增强钙钛矿的激光性能，还可显著改善其电学特性。此外，AuNPs能加速钙钛矿中热载流子冷却，从而降低非辐射复合损耗并缓解焦耳热效应。随着电辅助比例的逐步提升，微激光器阈值呈现明显下降趋势。这项研究表明实现电驱动钙钛矿微激光器的终极目标正在成为可能，为电泵浦微激光二极管的发展开辟了新途径。Figure 1. PL characterization of AuNPs@CsPbBr3 MPs. (a) Temperature-dependent PL spectra of the AuNPs@CsPbBr3 MP under 400 nm laser excitation. (b) Dependence of PL intensity on temperature. Variations of (c) PL peak positions and (d) FWHM versus the testing temperature. (e) Excitation fluence-dependent PL spectra of the AuNPs@CsPbBr3 MP. (f) Relationship between PL intensity and excitation fluence plotted in a logarithmic scale. (g) PL measurements of the AuNPs@CsPbBr3 MP conducted under six thermal cycles. Inset: PL intensity of the sample at two temperature points. (h) Temperature-dependent emission images of the AuNPs@CsPbBr3 MP.
Figure 2. Lasing characteristics of a specified CsPbBr3 MP before and after AuNPs modification. (a) PL spectra of the pristine CsPbBr3 MP as a function of the pump fluence. Inset: dark field luminescence image at a pump fluence of 42.8 μJ/cm2. (b) PL spectra of the AuNPs-modified CsPbBr3 MP as a function of pump fluence. Inset: dark field luminescence image at a pump fluence of 29.4 μJ/cm2. (c) PL spectra comparison of pristine and AuNPs-modified CsPbBr3 MPs at 29.0 μJ/cm2 excitation. (d) Pump-fluence-dependent integrated PL intensity for both pristine and AuNPs-modified CsPbBr3 MPs.
Figure 3. TA spectra obtained from CsPbBr3 MPs uncoated and coated with specific AuNPs upon laser excitation at 400 nm. Pseudo-color TA spectra of the (a) pristine CsPbBr3 MPs and (d) AuNPs-coated CsPbBr3 MPs. TA spectra at selected probe delay times for the (b) CsPbBr3 MPs and (e) MPs coated with AuNPs. Decay kinetics of the (c) CsPbBr3 MPs and (f) MPs coated with AuNPs, which are probed at selected wavelengths. (g) TA kinetics probed at the GSB peak. (h) Comparison of TA dynamics probed at the GSB peak. (i) Time evolution of the GSB peak for the as-prepared samples.
Figure 4. Influence of AuNPs on the optoelectronic properties of the CsPbBr3 MP. (a) Optical microscopy and fluorescence images of the CsPbBr3 MP uncoated and coated with AuNPs. (b) UV-visible absorption spectra of the CsPbBr3 MP uncoated and coated with AuNPs. (c) PL spectra of the CsPbBr3 MP uncoated and coated with AuNPs presented for comparison. (d) Optical image of the constructed AuNPs@CsPbBr3 MP device structure. (e) Logarithmic current density-voltage (J-V) characteristics of the MP MSM device. (f) Time-dependent on/off photoswitching tests of the MP MSM device. (g) TRPL decays of a CsPbBr3 MP uncoated and coated with AuNPs. (h) Electric-field distribution of an AuNP, which is prepared on the CsPbBr3 MP. (i) Distribution of the electric field in the x-z plane across the cross-section at the AuNP/CsPbBr3 interface.
Bingwang Yang (杨兵旺) received his MS degree from Zhengzhou University in 2021. Since 2022, he has been pursuing his PhD degree at the College of Physics, Nanjing University of Aeronautics and Astronautics. His research interests mainly focus on perovskite microcavity lasers and micro-nano optoelectronic devices.
Mingming Jiang (姜明明) received his BS degree from Dalian University of Technology, Dalian, China, and his PhD degree from the University of Science and Technology of China (USTC), Hefei, China. He was an associate professor at Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, China. He is currently a full professor at the College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing, China. His current research interest is low-dimension wide bandgap semiconductor optoelectronics.
Bingwang Yang, Maosheng Liu, Tong Xu, Yun Wei, Shulin Sha, Peng Wan, Caixia Kan, Daning Shi, Mingming. Surface modification of metal nanostructures toward electrically pumped perovskite microlasers. Sci. China Mater. (2025).
https://doi.org/10.1007/s40843-025-3629-3
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