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Lu3Ga5O12 and Y3Ga5O12 nano-garnets doped with 1.0mol% Ho3+ ions have been prepared by a citrate sol–gel method. Size distribution of the nano-garnets has been studied by dynamic light scattering technique. Intense green and weak red emissions have been observed in these nano-garnets under 751nm excitation. The observed green upconverted emission is due to photon avalanche process, characterized by...
Blue, green and red emissions have been generated at room temperature by upconversion processes under infrared laser excitation at 750 and 840nm in fluorozirconate glasses doped with Ho 3+ ions. The intense green emission, associated to the 5 S 2 , 5 F 4 → 5 I 8 transitions, has been carefully analysed in order to elucidate the mechanisms involved...
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