Abstract
Synthesis of pure and Yb3+, Er3+ and Er3+/Yb3+ doped La3Ga5.5Nb0.5O14 (LGN) ceramics by solid state reaction method and their photoluminescence characteristics are presented. Er3+ and Er3+/Yb3+doped LGN ceramics emit green light at 523 (2H11/2 → 4I15/2) and 551 (4S3/2 → 4I15/2) nm through down conversion upon UV excitation. Er3+/Yb3+-doped LGN ceramics also act as upconvertors, by transforming infrared excitation (973 nm) into UV light (4G11/2 → 4I15/2) which is due to three-photo energy transfer process. The emission characteristics confirm that LGN is a superior host material for both up and down conversions and hence it can be used for light emitting devices and biological applications. The effects of Er3+ and Yb3+ doping on the structure, morphology of the prepared ceramics were also studied and discussed.
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