Energy transfer in Cr and Nd co-doped Si-B-Na-Al-Ca-Zr-O glasses

Hughes, MA; Li, H; Curry, RJ; Suzuki, T; Ohishi, Y

Abstract

Cr and Nd co-doped glasses are potential gain media for solar pumped lasers (SPLs). Tanabe-Sugano analysis
shows that Cr doped Si-B-Na-Al-Ca-Zr-O (SBNACZ) glass contains a mixture of Cr3+ with octahedral coordination and Cr6+with unknown coordination. The crystal field parameters for Cr3+ were Dq = 1574 cm−1
,
B = 792.2 cm−1
, C = 3005 cm−1 and Dq/B = 1.99, indicating a low covalency of Cr-O bonds. We compared the
quantum efficiency (QE) of Nd and Cr co-doped SBNACZ glass with Nd doped SBNACZ glass to determine the
Cr3+→Nd3+ transfer QE. The Cr2O3 content was fixed at 0.1 mol.% and the Nd2O3 content was varied between
0.1 and 1 mol.%. A maximum transfer QE of 20% was obtained at 0.5 mol.% Nd2O3. Cr3+→Nd3+ energy transfer
is dominated by the coulombic interaction mechanism. The clustering of Nd3+ was a limiting factor for increasing the transfer QE with higher Nd3+ concentrations.

• Journal Article Type: Article
• Acceptance Date: Nov 6, 2019
• Online Publication Date: Dec 20, 2019
• Publication Date: Feb 15, 2020
• Deposit Date: Jan 6, 2020
• Publicly Available Date: Dec 20, 2020
• Journal: Journal of Non-Crystalline Solids
• Print ISSN: 0022-3093
• Publisher: Elsevier
• Volume: 530
• DOI: https://doi.org/10.1016/j.jnoncrysol.2019.119769
• Publisher URL: https://doi.org/10.1016/j.jnoncrysol.2019.119769
• Related Public URLs: https://www.sciencedirect.com/journal/journal-of-non-crystalline-solids