Cooperative down-conversion and near-infrared luminescence of Tb3+–Yb3+ co-doped CaMoO4 broadband phosphor. Issue 10 (December 2015)

• Record Type: Journal Article
• Authors: Bai, Wenxia; Liu, Yanhua; Wang, Yanping; Qiang, Xiaohu; Feng, Libang
• Is Part Of: Ceramics international. Volume 41:Issue 10(2015)Part A
• Page Start: 12896
• Page End: 12900
• Publication Date: 2015-12
• Subjects: Quantum cutting -- Tb3+/Yb3+ -- CaMoO4 -- Cooperative energy transfer -- Solar cell; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2015.06.128
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: An efficient near-infrared (NIR) quantum cutting (QC) CaMoO4 :Tb 3+, Yb 3+ phosphor promising for silicon solar cells was successfully prepared using combustion method. Upon the excitation at 306 nm, a green visible photon is emitted by Tb 3+, while two NIR photons are emitted by Yb 3+ through cooperative energy transfer (CET) from one Tb 3+ ion to two Yb 3+ ions. Visible to NIR emission, decay lifetimes of Tb 3+, and quantum efficiency (QE) are studied for samples with various Yb 3+ concentration. It has been found that the luminescence intensity at around 997 nm from Yb 3+ increases, however, it decreases at a high Yb 3+ co-doping content of 10% due to concentration quenching, while the emission and lifetime of Tb 3+ decreases monotonically as compared to that of Tb 3+ doped CaMoO4 . The maximum energy transfer efficiency (ETE) and the corresponding down-conversion (DC) QE are estimated to be 60.4% and 160.4%, respectively.