Аннотация: 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 ZnGa2O4:0.02Cr(3+) (ZGO:0.02Cr(3+)) is effectively regulated by chemical unit cosubstitution (Ge4+-Li+/Na+ for Ga3+-Zn2+) and excess cation substitution synergetic strategies, and the thermal stability is retained at 97.7% at room temperature and 150 degrees C. Ge4+-Li+ and Ge4+-Na+ replace the lattice position of Ga3+-Zn2+ to enhance the photoluminescence (PL) intensity and quantum efficiency (QE) of ZGO:0.02Cr(3+). The optimal doping contents of Ge4+-Li+ and Ge4+-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.
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Держатели документа:
Hunan Agr Univ, Sch Chem & Mat Sci, Changsha 410128, Peoples R China.
Hunan Opt Agr Engn Technol Res Ctr, Changsha 410128, Peoples R China.
Siberian Fed Univ, Krasnoyarsk 660041, Russia.
Sun Yat Sen Univ, Sch Chem, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China.
Доп.точки доступа:
Zhou, Cheng; Peng, L.u.; Kong, Zihui; Wu, Meihan; Molokeev, Maxim S.; Zhou, Zhi; Wang, Jing; Xia, Mao; National Natural Science Foundation of ChinaNational Natural Science Foundation of China (NSFC) [51974123]; Distinguished Youth Foundation of Hunan Province [2020JJ2018]; Key R & D projects in Hunan Province [2020WK2016, 2020SK2032]; Hunan High Level Talent Gathering Project [2019RS1077, 2020RC5007]; Natural Sciences Foundation of Hunan Agricultural University [19QN11]; Hunan Provincial Key Laboratory of Crop Germplasm Innovation and Resource Utilization Science Foundation [19KFXM12]; Changsha Science and technology plan [KH2005114]; Scientific Research Fund of Hunan Provincial Education DepartmentHunan Provincial Education Department [19C0903]; Innovation Training Program for College Students of Hunan Province [S202010537012]