A high thermal stability Cr3+-doped gallate far red phosphor for plant lighting: structure, luminescence enhancement and application prospect. Issue 15 (24th March 2022)

• Record Type: Journal Article
• Authors: Zhou, Cheng; Peng, Lu; Kong, Zihui; Wu, Meihan; Molokeev, Maxim S.; Zhou, Zhi; Wang, Jing; Xia, Mao
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 15(2022)
• Page Start: 5829
• Page End: 5839
• Publication Date: 2022-03-24
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc00614f
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : Structure modification optimization of ZGO:Cr 3+ phosphor for improving luminescence properties for plant growth. Abstract : Cationic substitution is a common material modification strategy. Generally, it follows the principles of radius matching, valency equilibrium and stoichiometric substitution. However, radius-mismatched, nonstoichiometric-ratio ion substitution can achieve unexpected experimental results. Such unexpected results are very important for expanding the research of materials, but the modification mechanism is still unclear. In this work, the optical performance of ZnGa2 O4 :0.02Cr 3+ (ZGO:0.02Cr 3+ ) is effectively regulated by chemical unit cosubstitution (Ge 4+ –Li + /Na + for Ga 3+ –Zn 2+ ) and excess cation substitution synergetic strategies, and the thermal stability is retained at 97.7% at room temperature and 150 °C. Ge 4+ –Li + and Ge 4+ –Na + replace the lattice position of Ga 3+ –Zn 2+ to enhance the photoluminescence (PL) intensity and quantum efficiency (QE) of ZGO:0.02Cr 3+ . The optimal doping contents of Ge 4+ –Li + and Ge 4+ –Na + are all 0.3 mol (PL intensity is 130.3% and 153.4% and QE = 77.4% and 85.1%). With further addition of Li + ions, the emission intensity and QE continued to increase to 176.4% and 83.8%, respectively. The synergistic effect of the mechanism on optical properties is explained via Rietveld refinement, optical band gap energy and thermoluminescence. Finally, LED devices were fabricated by using the ZGO:0.02Cr 3+, 0.03Ge 4+, 0.11Li + phosphor to investigate the effect on plant growth. The growth period was reduced and the fruit quality was improved in dwarf potted tomato, which shows the application prospect in plant growth of the ZGO:0.02Cr 3+ phosphor.