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Proceedings Paper

Optical properties and green upconversion emission from Er3+-doped sol-gel silica glasses under red light (632.8-nm) excitation
Author(s): Pham Nga Thu; Van Hoi Pham; Nguyen Xuan Nghia; C. Barthou; Vu Kim Lien; Le Ngoc Chung; Pham Nam Thang; Nguyen Cong Trang
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Paper Abstract

The sol-gel process has been employed to prepare highly doped Er3+ silica glasses, up to 5-wt% for homogeneous doping distribution. The optical characteristics of the silica glasses including the UV/VIS absorption and fluorescence emission spectra under excitation of 488 nm and 520 nm lights were measured. Micro-Raman spectra of these silica glasses heated at different temperatures from 200 degree(s)C to 1100 degree(s)C under 632.8 nm laser beam excitation of the He-Ne laser also recorded. The green up conversion emission from Er3+ ion doped into the silica glasses heated to 1000 degree(s)C under red light (632.8 nm) excitation has been observed. Two green and weak emission bands, centered at 525 and 550 nm, for the 2H11/2 yields 4I15/2 and 4S3/2 yields 4I15/2 transitions, respectively, have been observed. The blue upconversion emission er3+ at 300 K centered at 460 nm was observed rather strength depends on the He-Ne laser pump powers and the Er3+ concentration. The pump wavelength is far from any electronic absorption from the ground state of the Er3+ ion, but corresponds to the excited state absorption. This upconversion process was interpreted by the excited state absorption and an upconversion mechanisms is proposed.

Paper Details

Date Published: 19 July 1999
PDF: 2 pages
Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); doi: 10.1117/12.354987
Show Author Affiliations
Pham Nga Thu, Institute of Materials Science (France)
Van Hoi Pham, Institute of Materials Science (Vietnam)
Nguyen Xuan Nghia, Institute of Materials Science (Vietnam)
C. Barthou, Univ. Pierre et Marie Curie (France)
Vu Kim Lien, Institute of Materials Science (Vietnam)
Le Ngoc Chung, Institute of Materials Science (Vietnam)
Pham Nam Thang, Institute of Materials Science (Vietnam)
Nguyen Cong Trang, Institute of Materials Science (Vietnam)

Published in SPIE Proceedings Vol. 3749:
18th Congress of the International Commission for Optics
Alexander J. Glass; Joseph W. Goodman; Milton Chang; Arthur H. Guenther; Toshimitsu Asakura, Editor(s)

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