Abstract

In this study, a significant improvement of deep-red luminescence was successfully achieved via the substitution approach in the ${\rm{M}}{{\rm{n}}^{4 +}}$-activated ${\rm{C}}{{\rm{a}}_{14 - x}}{{\rm{K}}_x}{\rm{A}}{{\rm{l}}_{10}}{\rm{Z}}{{\rm{n}}_6}{{\rm{O}}_{35}}$ phosphor. The optimal ${\rm{M}}{{\rm{n}}^{4 +}}$ doping level $x$ was determined by studying luminescence concentration quenching behavior. The measured photoluminescence (PL) spectrum showed five distinct vibronic structures with the main peak centered at 712 nm. A theoretical simulation work was conducted for comparison, and the predominant phonon mode involving in the vibronic transition process was revealed. From the temperature-dependent PL spectra, an abnormal luminescence enhancement was observed at the temperature rising from ${\rm{T}} = {{100}}$ to 340 K, and the underlying phonon-assisted luminescence mechanism was theoretically disclosed. Finally, we studied the temperature-dependent luminescence lifetime, and the primary phonon energy in the vibronic behavior was identified from the fitting work.

© 2021 Optica Publishing Group

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