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Influence of Pressure‐Induced Transition from Nanocrystals to Nanoceramic Form on Optical Properties of Ce‐Doped Y 3 Al 5 O 12
Author(s) -
Podhorodecki Artur,
Gluchowski Pawel,
Zatryb Grzegorz,
Syperek Marcin,
Misiewicz Jan,
Lojkowski Witold,
Strek Wieslaw
Publication year - 2011
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.1551-2916.2010.04374.x
Subject(s) - nanoceramic , materials science , photoluminescence , spectroscopy , doping , analytical chemistry (journal) , amorphous solid , scanning electron microscope , phosphor , ceramic , optoelectronics , chemistry , crystallography , composite material , quantum mechanics , physics , chromatography
In this work, we have examined modifications of structural and optical properties of Y 3 Al 5 O 15 :Ce 3+ (Ce 3+ :YAG) material when transforming from nanograins to nanoceramic form under high pressure. Initial YAG material with 0.5% of Ce 3+ was prepared using modified Pechini and transformed to nanoceramic at low temperature with a working pressure of 4 GPa. Structural properties of both samples (nanopowder and nanoceramic) have been examined with X‐ray diffraction and scanning electron microscope. Optical properties have been examined using photoluminescence (PL) spectroscopy, PL‐excitation spectroscopy at different temperatures, and time‐resolved spectroscopy. Based on results obtained, excitation mechanism of Ce 3+ ions has been explained. The main 560 nm emission band along with a new 400 nm emission band allowed to cover the whole visible spectral range. Moreover, it has been found that under high‐pressure treatment the amorphous shell of YAG core appears, leading to increased 5 d electrons–lattice interaction. This, in turn, reduces PL decay time and increases emission intensity of nanoceramic sample.