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

Abstract

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 β-NaYF4:xEu3+ 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 ​°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.