Investigation of Two Photon Absorption of Ligand-Modified CsPbBr3 Quantum Dots

Wan-Hsuan Lin; Shao-Chien Pan; Jen-Feng Hsu; Zong-Liang Tseng; Siao-Shan Jyu; Ja-Hon Lin

doi:10.1021/acs.jpclett.2c02615

Investigation of Two Photon Absorption of Ligand-Modified CsPbBr₃ Quantum Dots

J Phys Chem Lett. 2022 Dec 8;13(48):11245-11252. doi: 10.1021/acs.jpclett.2c02615. Epub 2022 Nov 30.

Authors

Wan-Hsuan Lin¹, Shao-Chien Pan¹, Jen-Feng Hsu¹, Zong-Liang Tseng², Siao-Shan Jyu³, Ja-Hon Lin¹

Affiliations

¹ Department of Electro-Optical Engineering, National Taipei University of Technology, Taipei10608, Taiwan.
² Organic Electronics Research Center and Department of Electronic Engineering, Ming Chi University of Technology, New Taipei City243303, Taiwan.
³ Taiwan O-Film Technology Company Limited, New Taipei City22101, Taiwan.

PMID: 36448820
DOI: 10.1021/acs.jpclett.2c02615

Abstract

The characteristics and application of nonlinear absorption from CsPbBr₃ QDs film with the ligand-modified strategy have been investigated in this work. By means of a near-infrared fs Ti:sapphire laser as a light source, the up-conversion emission of CsPbBr₃ QDs film of around 518 nm revealed a quadratic increase with the pump intensity. Through the temperature-dependent up-conversion emission, we obtained the binding energy and longitudinal optical (LO) phonon energy of CsPbBr₃ QDs film of around 58.1 and 61.2 meV, respectively. Due to more active thermal coupling between the excited electron or hot phonon effect, the photon decay trace under two-photon excitation was prolonged at higher temperatures. The ligand-modified CsPbBr₃ QDs film exhibits a relatively large TPA coefficient of around 28.6 cm/GW by the open aperture Z-scan measurement, and it has been demonstrated as a promising nonlinear medium to obtain the pulsewidth of ultrafast lasers.