Superior thermally-stable narrow-band green emitter from Mn2+-doped zero thermal expansion (ZTE) material

Achieving highly thermostable red emission in singly Mn2+-doped BaXP2O7 (X = Mg/Zn) via self-reduction

“…21,22 A rigid structural framework usually increases the thermal quenching (TQ) temperature because of reduced electron-phonon coupling. [23][24][25] Another promising way is to generate proper charge defects to compensate for TQ nonradiative loss to improve the thermal stability of phosphors. [26][27][28] Kim et al reported temperature-dependent phase transition induced native defects to realize zero-TQ in a Na 3 Sc 2 (PO 4 ) 3 :Eu 2+ blue phosphor.…”

Synthesis, crystal structure, and anti‐thermal quenching performance of Lu2Sr(1−x)Al4SiO12:xEu2+ phosphors

“…The phosphor‐converted white light‐emitting diodes (PC‐WLEDs) technology has been widely used in daily life due to its environmental protection, sturdiness, and long service life. However, the problem of thermal quenching caused by the heat generated inside the LED chip leads to the disappointing reliability of high‐power PC‐WLEDs, which remains a bottleneck restricting their actual development 1,2 . Thermal quenching means that the excited luminescence center is activated by heat through phonon interaction, and then released through the intersection of the excited states and the ground states.…”

“…However, the problem of thermal quenching caused by the heat generated inside the LED chip leads to the disappointing reliability of high-power PC-WLEDs, which remains a bottleneck restricting their actual development. 1,2 Thermal quenching means that the excited luminescence center is activated by heat through phonon interaction, and then released through the intersection of the excited states and the ground states. To a large extent, temperature determines the probability of a thermal activated non-radiation transition.…”

Variation from Zero to Negative Thermal Quenching of Phosphor with Assistance of Defect States

“…To settle the fatal weakness that the fluorescence intensity declines significantly at high temperature, a strategy of energy transfer (ET) between a sensitizer and an activator to compensate the thermal energy loss is proposed, such as the ET from Eu 2+ to Mn 2+ in BaMgP 2 O 7 , Na 3 Sc 2 (PO 4 ) 3 , and Ca 3 Y­(PO 4 ) 3 was realized to achieve a good thermal stability. − However, it should be noticed that this approach sacrifices the optical properties of the sensitizers and the efficiency of ET may decrease sharply as the temperature increases. , Furthermore, exploring rigid and highly symmetrical crystal structure materials as the host matrix or taking the advantages of glass-crystallite phosphors to inhibit the non-radiative relaxation process is proposed. − Nevertheless, the phosphors with a high rigid structure have fewer matrix systems and higher synthesis conditions. − Converting phosphors into glass-crystallites is also not an ideal approach due to the weakening of emission intensity and quantum efficiency. , …”