铊（Tl⁺）激活离子对KCl₀.₅Br₀.₅:Eu²⁺粉末荧光粉发光特性的影响

Influence of Tl+ activator ions on the luminescence characteristics of KCl0.5Br0.5:Eu2+ powder phosphors.

作者信息

Nagarajan S, Sudarkodi R

机构信息

Department of Physics, Pondicherry Engineering College, Puducherry-605014, India.

出版信息

Luminescence. 2009 May-Jun;24(3):162-70. doi: 10.1002/bio.1090.

DOI:10.1002/bio.1090

PMID:19291812

Abstract

Photoluminescence (PL) of thallium co-doped with KCl0.5Br0.5:Eu2+ powder phosphors display emission bands at 320 and 370 nm attributable to centres involving Tl+ ions in addition to characteristic Eu2+ emission around 420 nm. Additional PL excitation and emission bandS observed around 260 and 380 nm, respectively, were observed in the double-doped KCl0.5Br0.5:Eu2+, Tl+ powder phosphors and are attributed to complex centres involving Tl+ and Eu2+ ions. The enhancement observed in the intensity of Eu2+ emission around 420 nm with the addition of TlBr in KCl0.5Br0.5:Eu2+ powder phosphors is attributed to the energy transfer from Tl+ --> Eu2+ ions. Photostimulated luminescence (PSL) studies of gamma-irradiated KCl0.5Br0.5:Eu2+, Tl+ mixed phosphors are reported and a tentative PSL mechanism in the phosphors has been suggested.

摘要

铊共掺杂的KCl0.5Br0.5:Eu2+粉末荧光粉的光致发光（PL）在320和370纳米处显示发射带，这归因于涉及Tl+离子的中心，此外在420纳米左右还有特征性的Eu2+发射。在双掺杂的KCl0.5Br0.5:Eu2+, Tl+粉末荧光粉中分别观察到在260和380纳米左右的额外PL激发和发射带，它们归因于涉及Tl+和Eu2+离子的复合中心。在KCl0.5Br0.5:Eu2+粉末荧光粉中添加TlBr后，在420纳米左右观察到的Eu2+发射强度增强归因于从Tl+到Eu2+离子的能量转移。报道了γ辐照的KCl0.5Br0.5:Eu2+, Tl+混合荧光粉的光激励发光（PSL）研究，并提出了该荧光粉中初步的PSL机制。