Defect-induced deep red luminescence of CaGdAlO4-type layered perovskites: multi-cationic sites partial/full substitution and application in pc-LED and plant lighting

• Published in: Dalton Transactions Vol. 52; no. 45; pp. 16780 - 16790
• Main Authors: Bowen, Wang, Gong, Changshuai, Xue, Xuyan, Li, Meiting, Zhu, Qi, Wang, Xuejiao, Ji-Guang, Li
• Format: Journal Article
• Language: English; Japanese
• Published: Cambridge Royal Society of Chemistry (RSC) 01.01.2023; Royal Society of Chemistry
• Subjects: Calcium ions; Cations; Defects; Gadolinium; Interstitials; Light emitting diodes; Luminescence; Oxygen; Perovskites; Phosphors; Photoelectrons; Photoluminescence; Substitution reactions; Thermoluminescence; X ray photoelectron spectroscopy
• ISSN: 1477-9226; 1477-9234; 1477-9234
• DOI: 10.1039/d3dt02805d

A series of CaGdAlO4-type layered perovskite phosphors showing deep red luminescence (λem = 711 nm, λex = 338 nm) were synthesized via a solid-state reaction. A comprehensive analysis performed via photoluminescence, X-ray photoelectron spectroscopy, thermoluminescence, and fluorescence decay revealed that the deep red luminescence is related to oxygen defects and particularly oxygen interstitials. The defect-related luminescence was effectively regulated through partial substitution of multi-cationic sites (the Ca2+ site with Mg2+, Sr2+, and Ba2+; the Gd3+ site with La3+, Y3+, and Lu3+) and full substitution of Gd3+ with Y3+. Remarkably, a 383.3% stronger luminescence was obtained through partial substitution with Lu3+, and the quantum yield of luminescence reached 28.74%, which is higher than those values of most previously reported self-luminescent systems. A pc-LED device was fabricated using this phosphor, and the device was shown to have potential application in indoor plant cultivation.