Charge carrier storage properties and the vacuum referred binding energy scheme for Li₂BaP₂O₇:Ln (Ln=Ce, Eu, TB, Yb)

The spectroscopic characterization at low temperature was performed for undoped and Ln doped (Ln=Ce³⁺, Eu³⁺, Eu²⁺, Tb³⁺, Yb³⁺) Li₂BaP₂O₇. Based on experimental data the vacuum referred binding energy (VRBE) scheme was constructed. Thermoluminescence properties were investigated and results show that the Ln-dopants do not play a role as electron traps in Li₂BaP₂O₇. Among all investigated samples the one doped with Eu²⁺ exhibits the best storage properties. The thermoluminescence and fading properties of Li₂BaP₂O₇:Eu²⁺ were measured and compared with that of a commercial BaFBr(I):Eu powder (AGFA). The results indicated that the produced materials have a storage capacity reaching 60% of the commercial phosphor. - Highlights: • Luminescence of Li₂BaP₂O₇:Ln, where Ln=Ce³⁺,Eu³⁺,Eu²⁺,Tb³⁺,Yb³⁺ is presented. • The vacuum referred binding energy (VRBE) scheme is constructed. • Storage properties of Li₂BaP₂O₇:Eu are investigated. • Thermoluminescence and fading of Li₂BaP₂O₇:Eu and a standard storage phosphor BaFBr(I):Eu are compared.