Suppression of charge imbalance via Li+-Mn4+ co-incorporated Sr2YSbO6 red phosphors for warm w-LEDs |
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Authors: | G Li X Lu Q Mao G Du M Liu L Chu J Zhong |
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Institution: | 1. Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China;2. Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China;3. New Energy Technology Engineering Laboratory of Jiangsu Province, School of Science, Nanjing University of Posts and Telecommunications, Nanjing 210023, China |
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Abstract: | Mn4+-activated double perovskite phosphors with composition diversity have presented excellent luminescent performances. However, the charge imbalance between Mn4+ and matrix cations would increase non-radiative recombination and reduce the structural stability. Here, novel high-efficiency stable Li+/Mn4+ co-incorporated Sr2YSbO6 red phosphors are successfully synthesized via a solid-state reaction method for warm w-LEDs, where the Li+ ions have the effect of charge balance for Sr2YSbO6:Mn4+ and reduce the non-radiative energy transfer among Mn4+ ions. It is demonstrated that the substitution of Li+–Mn4+ pairs for Sb5+ can enhance the bonding with low-shifted diffraction peaks and high emission intensity, and prolong the decay lifetime, compared with those of Mn4+ single-doped ones. Impressively, the thermal stability is enhanced to 89.72% from 84.61% at the original value of 303 K. Finally, a w-LED device based on the optimal phosphor Sr2YSbO6:0.01Mn4+/0.01Li+ red component exhibits a correlated color temperature of 4487 K and color rendering index of 80.2. Therefore, the incorporated Li+ ions serve as both charge compensator and co-activator in Mn4+-activated double perovskite phosphors with the aim of high luminescent performance and thermal stability. |
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Keywords: | Luminescence properties Double perovskite Charge balance White light-emitting diodes |
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