Ruegenberg Freia, Seibald Markus, Baumann Dominik, Peschke Simon, Schmid Philipp C, Huppertz Hubert
Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria.
OSRAM Opto Semiconductors GmbH, Mittelstetter Weg 2, 86830, Schwabmünchen, Germany.
Chemistry. 2020 Feb 17;26(10):2204-2210. doi: 10.1002/chem.201904526. Epub 2020 Jan 21.
Understanding the origin and mechanisms of luminescence is a crucial point when it comes to the development of new phosphors with targeted luminescence properties. Herein, a new phosphor belonging to the substance class of alkali metal lithosilicates with the generalized sum formula Cs Rb Na Li [Li SiO ] :Eu is reported. Single crystals of the cyan-emitting UCr C -type phosphor show a peculiar double-band luminescence with one ultranarrow emission band at 473 nm and a narrow emission band at 531 nm under excitation with UV light (λ =408 nm). Regarding occupation of the channels by the light metal ions, investigations of single-crystal XRD data led to the assumption that domain formation with distinct lithium- and sodium-filled channels occurs. Depending on which of these channels hosts the activator ion Eu , a green or blue emission results. The herein-presented results shed new light on the luminescence process in the well-studied UCr C -type alkali metal lithosilicate phosphors.
在开发具有特定发光特性的新型磷光体时，了解发光的起源和机制是关键所在。在此，报道了一种新的磷光体，它属于碱金属锂硅酸盐物质类别，通式为CsRbNaLi[LiSiO]：Eu。发射青色光的UCrC型磷光体单晶在紫外光（λ = 408 nm）激发下呈现出奇特的双带发光，一个超窄发射带位于473 nm，一个窄发射带位于531 nm。关于轻金属离子对通道的占据情况，单晶XRD数据研究得出假设，即会形成具有不同锂填充和钠填充通道的畴。根据这些通道中哪个容纳激活离子Eu，会产生绿色或蓝色发射。本文所呈现的结果为深入研究的UCrC型碱金属锂硅酸盐磷光体的发光过程提供了新的见解。
