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Energy transfer process and temperature-dependent photoluminescence of PbS quantum dot-doped glasses |
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| Authors: | Xiongjian Huang Zixing Peng Qianyi Guo Xiaoqian Song Jianrong Qiu Guoping Dong |
| Affiliation: | 1. State Key Laboratory of Luminescent Materials and Devices, and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, China;2. State Key Laboratory of Luminescent Materials and Devices, and Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques, South China University of Technology, Guangzhou, China
Guangdong Engineering Technology Research and Development Center of Special Optical Fiber Materials and Devices, School of Materials Science and Engineering, South China University of Technology, Guangzhou, China;3. State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, China |
| Abstract: | PbS quantum dot (QD)-doped glasses were fabricated through melt-quenching method. After heat treatment schedule, uniform QDs were precipitated in the glasses and near-infrared emission covering 900-1700 nm was obtained under excitation. From photoluminescence (PL) spectra and lifetime decay curves, the whole emission band of QD-doped glasses consisted of emission from the 1S-1S state and the trap state. While using excitation with higher energy, the full width at half maximum (FWHM) of QD-doped glasses broadened because smaller QDs were excited. Energy transfer process among QDs was revealed by measuring the lifetime of different emission bands in PL spectrum and the energy transferred from smaller QDs with broader bandgap to bigger QDs with narrow bandgap. Temperature-dependent PL and the corresponding lifetime decay curves of PbS QD-doped glasses were analyzed. Temperature-dependent bandgap structure of PbS QDs was obtained by using density functional theory (DFT) calculations. The results here give deep insight into optical properties of PbS QD-doped glasses and it is beneficial to design and develop high-performance QD-based optoelectronic devices in theory. |
| Keywords: | energy transfer glass PbS quantum dot temperature-dependent photoluminescence |