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10 September 2010 Effect of ammonia on luminescent properties of YAG:Ce3+,Pr3+ nanophosphors
Jorge Oliva, Elder De La Rosa, Luis A. Diaz-Torres, Pedro Salas, Alejandro Torres, Octavio Meza
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Proceedings Volume 7755, Nanophotonic Materials VII; 77550E (2010) https://doi.org/10.1117/12.861049
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States
Abstract
This work presents the structural, morphological and luminescent properties of Y3Al5O12:Ce3+(0.1%)-Pr3+(0.1%) nanophosphors synthesized by a hydrothermal precipitation method. It was observed that the incorporation of Amonium hydroxide (NH4OH, Ammonia) increases the YAG (%)/YAM(%) ratio, leading to an increase of 83% in the overall emission under 460 nm excitation. The nanophosphor with the highest content of YAM, presented the best broad green-yellow- red emission band corresponding to Ce3+ and Pr3+ emissions under 340 nm excitation. The average nanocrystallite size was 50 and 55 nm for the samples with and without Ammonia respectively. Quenching of the overall emission after an annealing treatment at 1100°C is observed in spite of reaching single YAG crystalline phase. That suggests Pr4+ and/or color centers formation due to the estequiometric unbalance as a consequence of the YAM to YAG transformation. By taking advantage of the broad emission under 340 nm and using a blue dye, we produced white light with CIE coordinates of (0.30, 0.36).
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Jorge Oliva, Elder De La Rosa, Luis A. Diaz-Torres, Pedro Salas, Alejandro Torres, and Octavio Meza "Effect of ammonia on luminescent properties of YAG:Ce3+,Pr3+ nanophosphors", Proc. SPIE 7755, Nanophotonic Materials VII, 77550E (10 September 2010); https://doi.org/10.1117/12.861049
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KEYWORDS
YAG lasers
Crystals
Luminescence
Color centers
Absorption
Cerium
Annealing
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