A new type of zero thermal quenching red emitting phosphor β-NaYF4:Eu3+ for NUV LEDs

Currently, searching for high luminescent thermal stability phosphors has become crucially significant for phosphor-converted white light-emitting diodes. Herein, it is shown that photoluminescence in a beta-NaYF4:xEu(3+) red emitting phosphor exhibits a new type of zero thermal quenching effect. That is that integrated emission intensities nonlinear monotonically increase with the increasing of temperature from 308 to 500 K (35-227 degrees C). For example, the integrated emission intensity at 500 K is 301.9% of that initial value at 308 K. The effect results in the optimal sample having high luminescent thermal stability. A thermal light energy conversion mechanism is suggested for the effect.

Automated summary

A new type of zero thermal quenching effect has been discovered in red-emitting phosphors, leading to high luminescent thermal stability. The integrated emission intensity nonlinearly increases with temperature, indicating the potential application of these phosphors in high-brightness lighting.