Li Guixian, Shi Xingyang, Lu Xinyue, Mao Qinan, Pei Lang, Zhu Yiwen, Liu Meijiao, Chu Liang, Zhong Jiasong
Center of Advanced Optoelectronic Materials, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou 310018, China.
Department of Chemistry, Zhejiang Sci-Tech University, Hangzhou 310018, China.
Inorg Chem. 2021 Nov 15;60(22):17398-17406. doi: 10.1021/acs.inorgchem.1c02969. Epub 2021 Nov 1.
Modulating the crystal field environment around the emitting ions is an effective strategy to improve the luminescence performance of the practical effective phosphor materials. Here, smaller Y ions are introduced into substituting the Gd sites in BaGdNbO:Mn phosphor to modify the optical properties, including the enhanced luminescence intensity, redshift, and longer lifetime of the Mn ions. The substitution of smaller Y ions leads to lattice contraction and then strengthens pressure on the local structure, enhances lattice rigidity, and suppresses nonradiative transition. Moreover, the prototype phosphor-converted light-emitting diode (LED) demonstrates a continuous change photoelectric performance with a correlated color temperature of 4883-7876 K and a color rendering index of 64.1-83.2, suggesting that it can be one of the most prospective fluorescent materials applied as a warm red component for white LEDss. Thus, the smaller ion partial substitution can provide a concise approach to modulate the crystal field environment around the emitting ions for excellent luminescence properties of phosphors toward the modern artificial light.
调节发光离子周围的晶体场环境是提高实用有效荧光粉材料发光性能的有效策略。在此，将较小的Y离子引入到BaGdNbO:Mn荧光粉中取代Gd位点，以改变光学性质，包括增强Mn离子的发光强度、红移和更长的寿命。较小的Y离子的取代导致晶格收缩，进而增强对局部结构的压力，提高晶格刚性，并抑制非辐射跃迁。此外，原型荧光粉转换发光二极管（LED）表现出连续变化的光电性能，相关色温为4883 - 7876 K，显色指数为64.1 - 83.2，表明它可以成为用作白光LED暖红色成分的最具前景的荧光材料之一。因此，较小离子的部分取代可以提供一种简洁的方法来调节发光离子周围的晶体场环境，以实现荧光粉对现代人造光的优异发光性能。
