Energy transfer process and temperature‐dependent photoluminescence of PbS quantum dot‐doped glasses

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.

Glass Ceramic Fibers Containing PbS Quantum Dots for Fluorescent Temperature Sensing

“…More importantly, PbS QDs can be controllably precipitated in glass to prepare GCs. Previously, PbS QDs GCs have proved to be excellent candidates for temperature sensing because the bandgaps of PbS QDs were modulated via adjusting temperatures [31]. Furthermore, optical fibers are prepared by using PbS QDs GCs as core materials, providing significant opportunities for constructing novel fluorescent fiber temperature sensors.…”