NIR to visible upconversion in nanocrystalline and bulk Lu2O3:Er3+

被引：121
|
作者：
Vetrone, F
Boyer, JC
Capobianco, JA
Speghini, A
Bettinelli, M
机构：
[1] Concordia Univ, Dept Chem & Biochem, Montreal, PQ H3G 1M8, Canada
[2] Univ Verona, Dipartimento Sci & Tecnol, I-37134 Verona, Italy
[3] UdR Verona, INSTM, I-37134 Verona, Italy
来源：
JOURNAL OF PHYSICAL CHEMISTRY B | 2002年 / 106卷 / 22期
关键词：
D O I：
10.1021/jp020256m
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
In this paper we investigate the upconversion luminescence of bulk and nanocrystalline Lu1.98Er0.02O3 following excitation into the I-4(11/2) level using 980 nm radiation. After NIR continuous wave excitation, blue, green, and red emissions were observed for both samples under investigation with the green emission dominating the upconversion spectrum. A power study reveals that the S-4(3/2) (green) and F-4(9/2) (red) emitting levels are populated via two-photon excited-state absorption (ESA) and energy-transfer upconversion (ETU) processes. Upconversion from the P-2(3/2) level is attained via a three-step phonon-assisted energy-transfer process. A marked temperature dependence of the excited-state lifetimes in both the bulk and nanocrystalline samples was evidenced.
引用
收藏
页码：5622 / 5628
页数：7
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