Zhao Ming, Cao Kun, Liu Mengjia, Zhang Jing, Chen Rong, Zhang Qinyuan, Xia Zhiguo
The Beijing Municipal Key Laboratory of New Energy Materials and Technologies, School of Materials Sciences and Engineering, University of Science and Technology Beijing, Beijing, 100083, P. R. China.
State Key Laboratory of Digital Manufacturing Equipment and Technology, School of Mechanical Science and Engineering, Huazhong University of Science and Technology, Wuhan, Hubei, 430074, P. R. China.
Angew Chem Int Ed Engl. 2020 Jul 27;59(31):12938-12943. doi: 10.1002/anie.202003150. Epub 2020 May 20.
The stability of luminescent materials is a key factor for the practical application in white light-emitting diodes (LEDs). Poor chemical stability of narrow-band green-emitting RbLi(Li SiO ) :Eu (RLSO:Eu ) phosphor hinders their further commercialization even if they have excellent stability against thermal quenching. Herein, we propose an efficient protection scheme by combining the surface coating of amorphous Al O and hydrophobic modification by octadecyltrimethoxysilane (ODTMS) to construct the moisture-resistant dual-shelled RLSO:Eu @Al O @ODTMS composite. The growth mechanisms of both the Al O inorganic layer and the silane organic layer on the phosphor surface are investigated. The results remarkably improve the water-stability of this narrow-band green emitter. The evaluation of the white LED by employing this composite as the green component demonstrates that RLSO:Eu @Al O @ODTMS is a promising candidate for the high-performance display backlights, and this dual-shelled strategy provides an alternative method to improve the moisture-resistant property of humidity-sensitive phosphors.
发光材料的稳定性是其在白光发光二极管（LED）中实际应用的关键因素。窄带绿色发光的RbLi(Li SiO ) :Eu （RLSO:Eu ）荧光粉化学稳定性较差，即使它们具有优异的抗热猝灭稳定性，也阻碍了其进一步商业化。在此，我们提出了一种有效的保护方案，通过结合非晶态Al O 的表面包覆和十八烷基三甲氧基硅烷（ODTMS）的疏水改性，构建了耐湿双壳层RLSO:Eu @Al O @ODTMS复合材料。研究了荧光粉表面Al O 无机层和硅烷有机层的生长机制。结果显著提高了这种窄带绿色发光体的水稳定性。以该复合材料作为绿色组分对白光LED进行评估表明，RLSO:Eu @Al O @ODTMS是高性能显示背光源的一个有前途的候选材料，这种双壳层策略为提高湿度敏感荧光粉的耐湿性提供了一种替代方法。
