American Chemical Society
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Enhancement of Two-Photon Fluorescence and Low Threshold Amplification of Spontaneous Emission of Zn-processed CuInS2 Quantum Dots

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journal contribution
posted on 2018-01-30, 00:00 authored by Pengqi Lu, Ruifeng Li, Ni Yao, Xusheng Dai, Zhenyu Ye, Kai Zheng, Weiguang Kong, Wei Fang, Shuang Li, Qinghua Xu, Huizhen Wu
Heavy-metal-free I–III–VI2 quantum dots (QDs) have recently emerged as favorable alternatives to toxic II–VI QDs for optoelectronic and biological applications, but low fluorescence efficiency is a key issue related to the promising nanocrystals. In this work, we demonstrate big enhancement of two-photon fluorescence efficiency and low threshold two-photon pumped amplification of spontaneous emission (ASE) of Zn-processed CuInS2 (CIS) QDs for the first time. The change of two-photon process caused by Zn2+ cation exchange in CIS QDs is systematically investigated. Two-photon ASE in Zn-processed CIS QDs films is achieved with a record of low threshold fluence of 5.7 μJ/cm2. With high two-photon fluorescence quantum yields and low threshold ASE, the Zn-processed CIS QDs could become a promising candidate for two-photon bioimaging, nonlinear optical and novel QDs laser devices.