Zhang Jun-Cheng, Liu Yan-Jie, Yan Xu, Zhang Hong-Di, Zhang Jun, Wang Xiaoxiong, Han Wen-Peng, Long Yun-Ze, Sun Xin-Yuan
College of Physics, Qingdao University, Qingdao, 266071, China.
Department of Physics, Jinggangshan University, Ji'an, 343009, China.
Chemphyschem. 2017 Feb 2;18(3):269-273. doi: 10.1002/cphc.201600998. Epub 2016 Dec 27.
Self-activated phosphors are capable of generating optical emissions from the internal ion groups of host lattice before externally introducing luminescent ions. However, numerous self-activated phosphors only show luminescence at low temperature due to the thermally activated energy migration among ion groups at room temperature, severely confining their application conditions. In this letter, we propose a strategy to converting the low-temperature luminescence to a room-temperature one through changing the synthesis conditions to induce structural distortions and thus to limit energy migration. Room-temperature self-activated luminescence of Ca Nb O was accordingly achieved in submicroplates synthesized using the sol-gel method. By further coupling the blue broadband emission from Ca Nb O submicroplates with the characteristic luminescence of Ln (Pr , Sm , and Dy ) dopants, multicolor emissions were successively tuned through adjusting the concentration of Ln . Our results are expected to expand the scope of designing room-temperature self-activated phosphors and tuning multicolor emission.
自激活荧光粉能够在外部引入发光离子之前，从主体晶格的内部离子基团产生光发射。然而，由于室温下离子基团之间的热激活能量迁移，许多自激活荧光粉仅在低温下发光，这严重限制了它们的应用条件。在这封信中，我们提出了一种策略，通过改变合成条件来诱导结构畸变，从而限制能量迁移，将低温发光转换为室温发光。因此，在使用溶胶-凝胶法合成的亚微板中实现了Ca Nb O的室温自激活发光。通过进一步将Ca Nb O亚微板的蓝色宽带发射与Ln（Pr、Sm和Dy）掺杂剂的特征发光耦合，通过调节Ln的浓度连续调节多色发射。我们的结果有望扩大室温自激活荧光粉的设计范围并调节多色发射。
