[21a-S423-1~10] 13.9 Optical properties and light-emitting devices

[21a-S423-4] Investigation of luminescence quenching for Y₃Al₅O₁₂:Ce³⁺ using thermoluminescence excitation spectroscopy

〇Jumpei Ueda¹, Pieter Dorenbos², Adrie J.J. Bos², Andries Meijerink³, Setsuhisa Tanabe¹ (1.Kyoto Univ., 2.TU Delft, 3.Utrecht Univ.)

Keywords:phosphor,thermal quenching

Y₃Al₅O₁₂(YAG):Ce³⁺ is the most widely applied phosphor in white LEDs (w-LEDs), but luminescence quenching occurs at high temperature above 300°C. In the TL excitation (TLE) spectrum at high temperature, a TLE band due to the lowest Ce³⁺:5d₁ level was observed at around 450 nm. Based on our observations, we conclude that the luminescence quenching of YAG:Ce³⁺ at high temperatures is caused by the thermal ionization.