부산대학교 도서관

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 -NaYF 4 : x Eu3+ 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. The integrated emission intensities of NaYF 4 :0.07Eu3+ monotonically increase with the increasing of temperature, which can be attributed to negative thermal quenching effect. [Display omitted] • β -NaYF 4 :Eu3+ was synthesized with hydrothermal method. • The phosphor exhibits a new type of zero thermal quenching effect. • Integrated PL intensities monotonically increase with the increasing of temperatures. • The thermo-optic thermal stimulation of electrons mechanism is suggested for the effect. [ABSTRACT FROM AUTHOR]