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A Guanidinium-Based Mn4+-Doped Red-Emitting Hybrid Phosphor with High Stability

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journal contribution
posted on 09.12.2020, 23:04 by Hong Ming, Yifei Zhao, Yayun Zhou, Shuai Zhang, Yuanjing Wang, Enhai Song, Zhiguo Xia, Qinyuan Zhang
Great efforts have been put in search of phosphors to fulfill the requirements for phosphor-converted white light-emitting diodes (pc-WLEDs). Herein, a general organic–inorganic hybridization strategy was demonstrated in Mn4+-, Cr3+-, or Eu3+-doped guanidinium-based zero-dimensional hybrid fluorides to find phosphors for pc-WLEDs. Among which, GA3AlF6:Mn4+ (where GA represents the guanidinium cation [C­(NH2)3]+) was selected to reveal their crystal structure, local symmetry, and luminescence properties. Density functional theory calculations suggested that GA3AlF6 with a wide band gap (∼5.24 eV) and the Fi interstitials are generated to balance the charge differences caused by non-equivalent doping. The GA3AlF6:Mn4+ hybrid could sustain ∼573 K high temperature without degradation and keep 90.1% of the original luminescence intensity at ∼373 K. A pc-WLED with wide color gamut (108.3%) of National Television System Committee standard was fabricated with GA3AlF6:Mn4+, suggesting its potential in high-quality backlight displays. This work not only brings a brand-new kind of organic–inorganic fluoride phosphor family but also provides great guiding significance for future exploration of fluoride-based functional materials containing a hybrid structure.