Synthesis of Dy³⁺and Ce³⁺activated Sr₆BP₅O₂₀and Ca₆BP₅O₂₀borophosphate phosphors

Abstract

In this paper we report the modified solid state synthesis of Dy and Ce activated Sr6BP5O20, Ca6BP5O20 and (CaXSr(1−X))6BP5O20 phosphors. The prepared phosphors were characterized by the x-ray powder diffraction and photoluminescence techniques. The PL excitation spectra showed the excitation peaks ranging from 300 to 400 nm due to the 4f → 4f transitions of Dy3+ ions. This mercury-free excitation is useful for solid state lighting and light-emitting diode (LED). The PL emission spectrum of Dy3+ ion under 348 nm excitation was observed at 483 nm (blue) due to 4F9/2 → 6 H15/2 transitions. Other emissions were observed at 576 nm (yellow) due to 4F9/2 → 6H13/2 transitions and 670 nm (red) due to 4F9/2 → 6 H11/2 transitions in prepared borophosphate phosphor. Dy activated Ca6BP5O20 phosphor showed intense emission as compared with Sr6BP5O20 phosphors which have been reported in this paper. From these characteristics, Dy activated Sr6BP5O20, Ca6BP5O20 and (CaXSr(1−X))6BP5O20 phosphors are one of the candidates for the white LED. The PL emission spectra of Ce3+ ion in the Sr6BP5O20, Ca6BP5O20 and (CaXSr(1−X))6BP5O20 phosphors in the UV region under broad band excitation at around 247 nm are presented for the scintillation application.

Novel blue‐emitting SrMg2Al16O27:Eu2+ phosphor for solid‐state lighting

“…The third approach is using near ultraviolet (NUV) or blue LED sources to excite bi-or tri-colour phosphors to generate white light. Recently, we have reported some inorganic phosphors for lamp industry applications, such as silicate (9), tungstate (10,11), vanadates (12,13), sulphates (14)(15)(16)(17)(18)(19), borates (20), oxides (21), aluminates (22)(23)(24), sulphides (25)(26)(27), halophosphors (28)(29)(30)(31) and phosphates (32)(33)(34)(35)(36)(37)(38)(39)(40). Generally speaking.…”

White Light Emission from NaCaPO4:Dy3+ Phosphor for Ultraviolet‐Based White Light‐Emitting Diodes

“…In recent years, orthophosphates have become an important host due to their excellent thermal stability. Particularly, the luminescent properties on Dy 3+ ‐doped phosphate phosphors have attracted much attention due to their significant applications in SSL and especially for white light emission 20–22 . Trivalent dysprosium (Dy 3+ ) ion has two intense emission bands in the blue (470–500 nm) and yellow region (560–600 nm) 23 .…”

Greenish‐Yellow Emission from Dy3+‐Doped Y2O3 Nanophosphors

“…Actually, trivalent dysprosium ion (Dy 3+ ) has been extensively studied in various hosts due to its unique spectral properties 9–11 . It is well known that white light can be obtained by mixing blue and yellow light, for instance, the integration of the blue LED chip with yellow phosphor.…”