Synthesis, Morphology, and Optical Characterization of Nanocrystalline Er3+:Y2O3

被引:57
作者
Chandra, Sreerenjini [1 ]
Deepak, Francis Leonard [1 ,2 ]
Gruber, John B. [1 ]
Sardar, Dhiraj K. [1 ]
机构
[1] Univ Texas San Antonio, Dept Phys & Astron, San Antonio, TX 78249 USA
[2] Int Iberian Nanotechnol Lab, P-4715 Braga, Portugal
基金
美国国家科学基金会;
关键词
CRYSTAL-FIELD ANALYSIS; RARE-EARTH IONS; UP-CONVERSION; ENERGY-LEVELS; SPECTRA; Y2O3; LUMINESCENCE; SPECTROSCOPY; PHONON; GREEN;
D O I
10.1021/jp909457g
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
We describe a methodology to synthesize trivalent-erbium (Er3+)-doped yttrium oxide (Y2O3) nanoparticles. An in-depth morphology analysis indicates that the average diameter of the individual nanoparticles is about 25 rim. To optically characterize the nanocrystalline material, the room-temperature absorption spectrum has been obtained between 400 and 900 nm. The spectrum consists of six absorption bands, including (2)G(1)(9/2) F-4(3/2) + F-4(5/2), F-4(7/2), H-2(2)(11/2) + S-4(3/2), F-4(9/2), and I-4(9/2). The room-temperature fluorescence Spectra of the Er3+ (4f(11)) H-2(2)(11/2) + S-4(3/2) -> I-4(15/2) and F-4(9/2) -> I-4(15/2) transitions were analyzed for the crystal-field splitting of the energy levels of these states of erbium. We have measured the lifetimes for the H-2(2)(11/2) + S-4(3/2) and F-4(9/2) metastable states and have investigated the effects of Er3+ concentrations and particle size oil the emission intensity and decay times, The experimental energies (Stark levels) agree well within the experimental error with the theoretical values reported earlier for bulk single crystalline Er3+:Y2O3. Detailed structural and optical analyses suggest that the nanoparticles of Er3+:Y2O3 have potential applications in diverse fields of photonics including laser systems and optical communication devices.
引用
收藏
页码:874 / 880
页数:7
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