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Efficient Near Infrared to Visible and Near‐Infrared Upconversion Emissions in Transparent (Tm 3+ , Er 3+ )‐α‐Sialon Ceramics
Author(s) -
Kshetri Yuwaraj K.,
Joshi Bhupendra,
DiazTorres Luis Armando,
Lee Soo Wohn
Publication year - 2017
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/jace.14573
Subject(s) - photon upconversion , materials science , infrared , transparent ceramics , photoluminescence , ceramic , sialon , optoelectronics , excitation , absorption (acoustics) , doping , analytical chemistry (journal) , optics , chemistry , composite material , physics , quantum mechanics , chromatography
Intense visible and near‐infrared frequency upconversion and a frequency downconversion photoluminescence have been reported for the first time in Tm 3+ and Er 3+ co‐doped transparent α‐Sialon ceramics under 980 nm excitation. The α‐Sialon ceramics were prepared by hot‐press sintering technique. Intense upconversion bands at 554, 678, 803 nm, and a downconversion band at 1530 nm were observed as a result of the efficient energy transfer between Er 3+ and Tm 3+ ions. The quadratic dependence of upconversion intensities on the excitation power indicates that the upconversion process is governed by two‐photon absorption process. The sintered samples of thickness 0.20 mm have transparency above 80% in the range of 2000 to 4200 nm and it reaches as high as 82% at 3350 nm. Moderately low phonon energy was found with the highest frequency band at 828 cm −1 . These novel properties manifest the potential applications of transparent α‐Sialon ceramics as a multifunctional material.