Disorder–Order Conversion-Induced Enhancement of Thermal Stability of Pyroxene Near-Infrared Phosphors for Light-Emitting Diodes
Journal
Angewandte Chemie - International Edition
Date Issued
2022
Author(s)
Abstract
The minimization of thermal quenching, which leads to luminescence loss at high temperatures, is one of the most important issues for near-infrared phosphors. In the present work, we investigated the properties of near-infrared Ca(Sc,Mg)(Al, Si)O6 : Cr3+ phosphors with a pyroxene-type structure under blue light excitation. The CaScAlSiO6 : Cr3+ end member of Ca(Sc,Mg)(Al,Si)O6 : Cr3+ phosphor led to broadband emission at a full-width half maximum of 215 nm, whereas the CaMgSi2O6 : Cr3+ end member exhibited high thermal stability at 150 °C, with an intensity of 88.4 % of that at room temperature. The structural analysis and density functional theory calculations revealed the absence of soft conformations and local space confinement contributed to the high structural rigidity and weakened the thermal quenching effect. © 2022 Wiley-VCH GmbH.
Subjects
Cr3+; Near-Infrared Light; Ordering/Disordering; Structural Rigidity; Thermal Quenching
SDGs
Other Subjects
Density functional theory; Infrared devices; Light; Light emission; Light emitting diodes; Quenching; Rigidity; Silicate minerals; Thermodynamic stability; Cr 3+; Disorder-order; Endmembers; Lightemitting diode; Minimisation; Near infrared light; Near-infrared phosphors; Ordering/disordering; Structural rigidity; Thermal quenching; Phosphors
Type
journal article