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S. GEORGESCU1,* , A. M. VOICULESCU1, O. TOMA1, L. GHEORGHE1, A. ACHIM1, C. MATEI1, S. HAU1
In order to evaluate the possibilities of Eu-doped langasite, langanite, and langatate as red phosphors, we estimate the quantum efficiency of 5D0 level and the relative quantum yield. The radiative lifetime is obtained from the luminescence spectra calibrated with the magnetic dipole transition 5D0 → 7F1. The comparison of the radiative lifetimes and the measured lifetimes allows the calculation of the quantum efficiency of 5D0 level. The diffuse reflectance spectra are used to compare the relative quantum yields of these materials with the quantum yield of a more efficient phosphor, Eu-doped YVO4, previously synthesized by us. The quantum yield of Eu-doped langasite, langanite, and langatate represents approximately 60% of the quantum yield of our Eu:YVO4.
Langasite, Langanite, Langatate, Eu3+, Quantum efficiency, Quantum yield.
S. GEORGESCU, A. M. VOICULESCU, O. TOMA, L. GHEORGHE, A. ACHIM, C. MATEI, S. HAU, Luminescence efficiency of europium-doped LGS, LGT and LGN crystals, Optoelectronics and Advanced Materials - Rapid Communications, 4, 12, December 2010, pp.1937-1941 (2010).
Submitted at: Nov. 8, 2010
Accepted at: Nov. 29, 2010
Optoelectronics and Advanced Materials - Rapid Communications
(2023): 0.5 - 2023 Journal Citation Reports (Clarivate Analytics, 2024)
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