Optical properties and green upconversion emission from Er3+-doped sol-gel silica glasses under red light (632.8-nm) excitation

Pham Nga Thu; Van Hoi Pham; Nguyen Xuan Nghia; C. Barthou; Vu Kim Lien; Le Ngoc Chung; Pham Nam Thang; Nguyen Cong Trang

doi:10.1117/12.354987

19 July 1999 Optical properties and green upconversion emission from Er³⁺-doped sol-gel silica glasses under red light (632.8-nm) excitation

Pham Nga Thu, Van Hoi Pham, Nguyen Xuan Nghia, C. Barthou, Vu Kim Lien, Le Ngoc Chung, Pham Nam Thang, Nguyen Cong Trang

Author Affiliations +

Proceedings Volume 3749, 18th Congress of the International Commission for Optics; (1999) https://doi.org/10.1117/12.354987
Event: ICO XVIII 18th Congress of the International Commission for Optics, 1999, San Francisco, CA, United States

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 ²H_11/2 yields ⁴I_15/2 and ⁴S_3/2 yields ⁴I_15/2 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.

Citation Download Citation

Pham Nga Thu, Van Hoi Pham, Nguyen Xuan Nghia, C. Barthou, Vu Kim Lien, Le Ngoc Chung, Pham Nam Thang, and Nguyen Cong Trang "Optical properties and green upconversion emission from Er³⁺-doped sol-gel silica glasses under red light (632.8-nm) excitation", Proc. SPIE 3749, 18th Congress of the International Commission for Optics, (19 July 1999); https://doi.org/10.1117/12.354987

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