Solution combustion synthesis of high-entropy rare earth oxide Ce_(0.2)La_(0.2)Gd_(0.2)Y_(0.2)Lu_(0.2)O_(1.6):xEu^(3+) phosphor with intense blue-light excitable red emission for solid-state lighting  

作　　者：Ziqing Yin Yufeng Mao Shikao Shi Jiye Wang Ruilong Zong 

机构地区：[1]College of Chemistry and Materials Science,Hebei Key Laboratory of Inorganic Nanomaterials,Hebei Normal University,Shijiazhuang 050024,China [2]Department of Chemistry,Tsinghua University,Beijing 100084,China

出　　处：《Journal of Advanced Ceramics》2024年第11期1852-1860,共9页先进陶瓷（英文）

基　　金：financially supported by the National Natural Science Foundation of China(No.51972097);the Science Foundation of Hebei Normal University,China(No.L2019K11)。

摘　　要：Red-light-emitting phosphors capable of being well excited with blue light are highly desirable in solid-state lighting.In this work,a novel Eu^(3+)-activated high-entropy rare earth oxide Ce_(0.2)La_(0.2)Gd_(0.2)Y_(0.2)Lu_(0.2)O_(1.6):xEu^(3+)(x=4–16 mol%)phosphor was successfully prepared by solution combustion reaction for the first time.The multi-composition rare earth oxide has a specific cubic fluorite structure,which is almost the same as that of the pure CeO_(2) despite the tiny ceria composition in the sample,demonstrating the formation of a high-entropy composite solid solution.To our surprise,the high-entropy phosphor exhibits extremely intense red emission at 613 nm,corresponding to the 5D0→7F2 characteristic transition of Eu^(3+)under the excitation of blue light at 466 nm.The luminescence internal quantum yield(QY)for the optimal high-entropy phosphor(x=12 mol%)reaches nearly 50%and can further increase to 67.8%through a subsequent heat-treatment process at 1400°C.The QY result is much superior to that of previously reported Eu^(3+)-activated CeO_(2) as well as Y2Ce2O7 and La2Ce2O7 low-entropy composite oxides(QYs are approximately 10%–20%).Moreover,the high-entropy oxide phosphor also shows better luminescence thermal stability than low-entropy oxides,as confirmed from the temperature-dependent photoluminescence emission spectra.The tremendous improvement in optical properties depends closely upon the high-entropy and other related effects.The novel high-entropy rare earth oxide phosphor is beneficial to be used in the field of solid-state lighting owing to the coincidence of excitation of blue light with the emission of InGaN light-emitting diode(LED)chips.

关 键 词：high-entropy oxide rare earth red phosphor solid-state lighting 

分 类 号：TB33[一般工业技术—材料科学与工程]