Light yield and thermal quenching of Ce³⁺ and Pr³⁺ co-doped LaBr₃:Sm²⁺ near-infrared scintillators

LaBr₃:Ce³⁺ is a compound with excellent scintillation properties, but its ultraviolet emission does not match well with the detection efficiency curves of silicon based photodetectors. In this work, Sm²⁺ is studied as an activator for LaBr₃ as its near-infrared emission can be detected with close to...

Photoluminescence and excited states dynamics of Tm²⁺-doped CsCa(Cl/Br)₃ and CsCa(Br/I)₃ perovskites

In this study, we systematically vary the Cl/Br and Br/I ratios in CsCaX₃:Tm²⁺ (X = Cl, Br, I) and hereby gradually shift the positions of the Tm²⁺ 4f¹²5d¹-levels as relative to the two 4f¹³ levels. At low temperatures up to five distinct Tm²⁺ 4f¹²5d<sup>1...

Converting SrI ₂ :Eu ²⁺ into a near infrared scintillator by Sm ²⁺ co-doping

The luminescence and scintillation properties of SrI ₂ single crystals doped with 5% Eu ²⁺ and 0.05%, 0.2% and 0.5% Sm ²⁺ are evaluated. X-ray excited and photoluminescence measurements show energy transfer from excited Eu ²⁺ ions to Sm ²⁺ ions. At a concentration of 0.5% Sm <sup>2+</sup...

Improvement of LaBr3:5%Ce scintillation properties by Li1, Na1, Mg21, Ca21, Sr21, and Ba21 co-doping

This paper reports on the effects of Liþ, Naþ, Mg2þ, Ca2þ, Sr2þ, and Ba2þ co-doping on the scintillation properties of LaBr3:5%Ce3þ. Pulse-height spectra of various gamma and X-ray sources with energies from 8 keV to 1.33 MeV were measured from which the values of light yield and energy resolution were derived. Sr2þ and Ca2þ co-doped crystals...

High-resolution luminescence spectroscopy study of down-conversion routes in NaGdF4:Nd3+ and NaGdF4:Tm3+ using synchrotron radiation