[18p-G204-1~16] 13.8 Optical properties and light-emitting devices

[18p-G204-5] Quenching Processes by Thermal Ionization and Thermally Activated Crossover for 5d-4f Transition in Pr³⁺-doped Garnet Phosphors

〇Jumpei Ueda¹, Setsuhisa Tanabe¹, Andries Meijerink², Pieter Dorenbos³, Adrie Bos³ (1.Kyoto Univ., 2.Utrecht Univ., 3.TU Delft)

Keywords:phosphor, thermal quenching

We investigated thermally activated ionization and thermally activated crossover as the two possibilities of quenching of 5d luminescence in Pr³⁺-doped Y₃Al_5−xGa_xO₁₂. Varying the Ga content x gives the control over the relative energy level location of the 5d and 4f²:³P_J states of Pr³⁺ and the host conduction band (CB). Based on spectroscopic results, we demonstrated that the thermal quenching of Pr³⁺:5d¹-4f luminescence in Y₃Al_5−xGa_xO₁₂ with x = 0, 1, 2 is a thermally activated crossover while for x = 3, 4, 5 it results from the thermal ionization.