Photoluminescence enhancement of orange-emitting Ca₅(PO₄)₂SiO₄:Sm³⁺ phosphor through charge compensation of A⁺ (Li⁺, Na⁺ and K⁺) ions for white light-emitting diodes

Abstract

The orange-emitting Ca5-x(PO4)2SiO4:xSm3+ (C5PSO:Sm3+) phosphor was prepared via a simple solid-state method, and the charge compensators A+ (A = Li, Na and K) was codoped into C5PSO:Sm3+ for improving the...

Efficient and zero thermal quenching Sm3+-activated Li2LaTiTaO7 phosphor for white LEDs

“…The biexponential curves are due to the electron relaxation in the luminescence process of agglomerated materials although there is only one emission center, which is similar to other reported Sm 3+ -doped phosphors, such as Ca 2 LaNbO 6 :Sm 3+ , La 3 Ga 5 SiO 14 :Sm 3+ , Ca 5 (PO 4 ) 2 SiO 4 :Sm 3+ , and Ba 3 Lu(PO 4 ) 3 :Sm 3+ phosphors. 27,41–43 The decay lifetime decreases with the increasing Sm 3+ concentration due to the effect of non-radiative transition (shown in Fig. 6(b)).…”

“…18,19 Recently, Sm 3+ -doped phosphors have caused concerns in w-LEDs, such as KBaY(MoO 4 ) 3 :Sm 3+ , Ca 2 ZnSi 2 O 7 :Sm 3+ , NaSrLa(MoO 4 )O 3 :Sm 3+ , LiSrVO 4 :Sm 3+ , Ca 2 InSbO 6 :Sm 3+ , NaCaTiTaO 6 :Sm 3+ , Ca 2 GdNbO 6 :Sm 3+ , Ca 2 LaNbO 6 :Sm 3+ , Ca 2 LaSbO 6 :Sm 3+ , Ca 5 (PO 4 ) 2 SiO 4 :Sm 3+ , NaKLaNbO 5 :Sm 3+ , and Sr 2 TiO 4 :Sm 3+ . 20–31…”