This paper reports an up-conversion emission in violet (408 nm) from Nd3+-doped 93SiO(2):7TiO(2): 20AlO(1.5) glasses synthesized by the sol-gel process. Upon excitation at 583 nm (I-4(9/2)-->(4)G(5/2)), a bright violet up-conversion emission at 408 nm has been observed. The behavior of the up-conversion luminescence has been compared with that of the normal luminescence at both 408 and 1064 nm. The results show that while no concentration quenching for up to 2 mole Nd content is observed for the up-conversion emission, such an effect can be observed for the normal luminescence cases. Although the up-conversion luminescence has a shorter lifetime and weaker intensity, it is of use to the development of sol-gel glass-based waveguide lasers operating at the violet wavelength. (C) 2000 Elsevier Science Ltd. All rights reserved.
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Nagoya Inst Technol, Dept Frontier Mat, Field Adv Energy Convers, Showa Ku, Nagoya, Aichi 4668555, JapanNagoya Inst Technol, Dept Frontier Mat, Field Adv Energy Convers, Showa Ku, Nagoya, Aichi 4668555, Japan
Hayakawa, Tomokatsu
Sawa, Aya
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Nagoya Inst Technol, Dept Frontier Mat, Field Adv Energy Convers, Showa Ku, Nagoya, Aichi 4668555, JapanNagoya Inst Technol, Dept Frontier Mat, Field Adv Energy Convers, Showa Ku, Nagoya, Aichi 4668555, Japan
Sawa, Aya
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Nogami, Masayuki
Niiyama, Shotaro
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JGC Catalysts & Chem Ltd, Akiha Ku, Niigata 9560855, JapanNagoya Inst Technol, Dept Frontier Mat, Field Adv Energy Convers, Showa Ku, Nagoya, Aichi 4668555, Japan
Niiyama, Shotaro
Tanaka, Satoshi
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JGC Catalysts & Chem Ltd, Akiha Ku, Niigata 9560855, JapanNagoya Inst Technol, Dept Frontier Mat, Field Adv Energy Convers, Showa Ku, Nagoya, Aichi 4668555, Japan