Luminescence enhancement of single-component Ca19Zn2(PO4)14:Dy3+ white-emitting phosphor powders through partial substitution of PO43− with SiO44− and BO33-

摘要

? 2022 Elsevier Ltd and Techna Group S.r.l.A series of Ca19Zn2(PO4)14-yAGy:Dy3+ (AG = BO33?, SiO44?) white-emitting phosphors with partial PO43? substitution were synthesized through high-temperature solid-state reaction. The BO33? and SiO44? anionic groups were introduced into Ca19Zn2(PO4)14:Dy3+ for enhancing the luminescence of Dy3+. The X-ray diffraction results exhibited that all samples were assigned to the standard trigonal Ca19Zn2(PO4)14 structure with R3c (161) space group. The white emission spectrum of Dy3+-doped phosphors was composed of several characteristic peaks located at 484 nm, 575 nm and 665 nm, corresponding to 4F9/2 → 6H15/2, 6H13/2 and 6H11/2 electron transitions, respectively. After partial SiO44? and BO33? substituting PO43?, the luminescence intensity of Ca18.62Zn2(PO4)13.75(SiO4)0.25:0.38Dy3+ and Ca18.62Zn2(PO4)13.65(BO3)0.35:0.38Dy3+ samples were higher by 1.68 and 1.49 times than that of Ca18.62Zn2(PO4)14:0.38Dy3+ sample, respectively, due to the charge compensation and crystal field environment effect. The actual w-LEDs fabricated with as-prepared Ca18.62Zn2(PO4)13.75(SiO4)0.25:0.38Dy3+ and Ca18.62Zn2(PO4)13.65(BO3)0.35:0.38Dy3+ phosphors showed excellent optical performances. All results indicated that the single component Ca18.62Zn2(PO4)14-yAGy:0.38Dy3+ white-emitting phosphors could have a potential application in w-LEDs.