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Energy Transfer Process for the Blue Up‐Conversion in Calcium Aluminate Glasses Doped with Tm 3+ and Nd 3+
Author(s) -
Chung Woon Jin,
Heo Jong
Publication year - 2001
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.2001.tb00661.x
Subject(s) - analytical chemistry (journal) , aluminate , doping , energy transfer , excitation , materials science , emission intensity , oxide , mineralogy , chemistry , nuclear chemistry , optoelectronics , metallurgy , chromatography , cement , molecular physics , electrical engineering , engineering
Excitation of Tm 3+ to 3 H 4 using the 791 nm pump source showed the frequency up‐converted blue emission (∼480 nm) due to the Tm 3+ : 1 G 4 → 3 H 6 transition in Tm 3+ /Nd 3+ codoped CaO·Al 2 O 3 glasses. Intensity and lifetime changes with rare‐earth concentrations suggested the efficient energy transfer of Tm 3+ : 3 H 4 → Nd 3+ : 4 F 5/2 and Nd 3+ : 4 F 3/2 → Tm 3+ : 1 G 4 . The latter transfer enabled Tm 3+ to reach its 1 G 4 level, and the blue emission became possible through the 1 G 4 → 3 H 6 transition. Quantitative analysis with rate equations proved that these two transitions were the most efficient among all the possible energy transfer routes between Tm 3+ and Nd 3+ . Calculated up‐conversion efficiency of the Tm 3+ /Nd 3+ combination in CaO·Al 2 O 3 glass was 6.6 × 10 −3 , and it was ∼4 orders of magnitude larger than those reported for other oxide glasses.