Achieving Up-Conversion Amplified Spontaneous Emission through Spin Alignment between Coherent Light-Emitting Excitons in Perovskite Microstructures

• Published in: Photonics Vol. 9; no. 5; p. 353
• Main Authors: Zhu, Xixiang, Xie, Yulin, Ma, Xiaoling
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 01.05.2022
• Subjects: Alignment; Amplification; ASE; Coherent light; CsPbBr3 microrods; Excitons; Fluence; Glass substrates; Lasers; Lasing; Light; Light emission; light-emitting excitons; Linear polarization; Magnetic dipoles; Metal halides; Microscopy; Multiphoton absorption; Optical properties; Optical pumping; Perovskites; Polarization; Quantum dots; Spontaneous emission; Switches; up-conversion; Upconversion; United States > US; China
• ISSN: 2304-6732; 2304-6732
• DOI: 10.3390/photonics9050353

Metal hybrid perovskites have presented interesting infrared-to-visible up-conversion light-emitting lasing properties through multi-photon absorption. Here, when the optical pumping switches between circular and linear polarization, up-conversion amplified spontaneous emission (ASE) intensity exhibits large and small amplitudes, respectively, leading to a positive up-conversion ΔASE in the CsPbBr3 perovskite microrods. This observed phenomenon demonstrates that the coherent interaction between coherent light-emitting excitons is indeed established at the up-conversion ASE regime in the CsPbBr3 perovskite microrods. In addition, the positive up-conversion ΔASE indicates the orbital magnetic dipoles between coherent light-emitting excitons are conserved during up-conversion ASE action. Essentially, the up-conversion ΔASE results provide evidence that shows up-conversion ASE can be realized by the orbit−orbit polarization interaction between light-emitting excitons. Moreover, up-conversion ASE proportionally increased as the pumping fluence increased, which shows that orbit–orbit polarization interaction can be gradually enhanced between coherent light-emitting excitons by increasing pumping density in the CsPbBr3 perovskite microrods. Substantially, our studies provide a fundamental understanding of the spin alignment between coherent light-emitting excitons towards developing spin-dependent nonlinear lasing actions in metal halide perovskites.