Luminescence Temperature Quenching for Ce3+ and Pr3+ d-f Emission in YAG and LuAG

作者：Ivanovskikh, K. V.^*; Ogieglo, J. M.; Zych, A.; Ronda, C. R.; Meijerink, A.

来源：ECS Journal of Solid State Science and Technology, 2013, 2(2): R3148-R3152.

DOI：10.1149/2.011302jss

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The d-f emission from Ce3+ and Pr3+ in garnets is attracting considerable attention, especially in relation to application in white light LEDs and scintillators. An important aspect is the luminescence quenching temperature T-Q. It is not trivial to determine T-Q and to unravel the quenching mechanism. In this paper the T-Q of d-f emission for Ce3+ and Pr3+ are determined by temperature dependent lifetime measurements. The results show a T-Q for Pr3+ of 340 K for Y3Al5O12:Pr3+ (YAG: Pr) and 680 K for Lu3Al5O12:Pr3+ (LuAG: Pr). For Ce3+ the T-Q is too high to measure. An onset of quenching above 600 K (YAG: Ce) or 700 K (LuAG: Ce) is observed. The differences in T-Q between YAG and LuAG are explained by a smaller Stokes shift for the d-f emission in LuAG (similar to 2300 cm(-1)) compared to YAG (similar to 2750 cm(-1)) derived from low temperature luminescence spectra. The large difference in T-Q between Ce3+ and Pr3+ is related to the smaller energy difference between the lowest energetic fd state of Pr3+ and the next lower 4f(2) state (P-3(2)) compared to the 5d - 4f(1)(F-2(7/2)) energy difference for Ce3+. Both observations are consistent with luminescence temperature quenching by non-radiative relaxation from the 5d state to the 4f state described by a configurational coordinate diagram and not by thermally induced photoionization.

• 出版日期2013
• 单位浙江大学