Extraction and analysis of temperature-induced intrinsic absorption changes in the charge transfer band of YVO4

The real temperature-dependent variation in the absorption of the charge transfer band (CTB) is obscured due to its presence in the photoluminescence excitation (PLE) spectrum. To address this, a method based on the steady-state rate equation was developed to extract the intrinsic absorption of the CTB. The temperature-dependent absorption spectra of CTB in VO 4 3− groups were obtained by analyzing temperature-dependent photoluminescence (PL) spectra, PLE spectra, time-resolved spectra of YVO 4 , and the spectrum of a xenon (Xe) lamp. The results reveal that, in contrast to the changes in the PLE spectra of YVO 4 , the absorption of CTB increases with temperature in the absorption spectra, and the total absorption change of CTB with temperature in YVO 4 follows the Boltzmann distribution law. This work offers a new optical framework for CTB absorption analysis, potentially supporting the design of temperature-sensitive optical materials and devices.