发红光的Sm(II)磷光体：通过5d-4f和4f内跃迁实现Sm(AlX)（X = Cl，Br）中的热可切换发光。

Red emitting Sm(II) phosphors: thermally switchable luminescence in Sm(AlX) (X = Cl, Br) by 5d-4f and intra-4f transitions.

作者信息

Schäfer T C, Sorg J R, Sedykh A E, Müller-Buschbaum K

机构信息

Institute of Inorganic and Analytical Chemistry, Justus-Liebig Universität Gießen, Heinrich-Buff-Ring-17, DE-35392 Gießen, Germany.

Center for Materials Research (LAMA), Justus-Liebig Universität Gießen, Heinrich-Buff-Ring-16, DE-35392 Gießen, Germany.

出版信息

Chem Commun (Camb). 2021 Nov 11;57(90):11984-11987. doi: 10.1039/d1cc05357d.

DOI:10.1039/d1cc05357d

PMID:34709258

Abstract

Divalent samarium compounds of the constitution Sm(AlX), X = Cl, Br, show remarkable luminescence of Sm. At room temperature, the luminescence is dominated by parity-allowed broad-band 4f5d → 4f emission with additional D → F narrow-line emission. At 79 K, only the intra-4f-emission is observed, rendering the mechanism thermally switchable. The luminescence processes and their temperature dependence were determined including lifetime investigations for both, room temperature and 79 K, as well as quantum efficiency determinations. In addition, a new pathway for the synthesis of Sm(AlCl) and the previously unknown Sm(AlBr) is reported.

摘要

具有Sm(AlX)（X = Cl、Br）结构的二价钐化合物展现出显著的钐发光特性。在室温下，发光主要由宇称允许的宽带4f5d→4f发射以及额外的D→F窄线发射主导。在79 K时，仅观察到4f内发射，这使得该机制具有热可切换性。确定了发光过程及其温度依赖性，包括室温及79 K下的寿命研究以及量子效率测定。此外，还报道了一种合成Sm(AlCl)以及此前未知的Sm(AlBr)的新途径。