Ca8MgY(PO4)7:Eu2+,Mn2+: A Promising Phosphor in Near-Ultraviolet WLED Devices

Abstract

Through employing the solid-state process under significant temperature, we produced a sequence of single-element radiation-adjustable phosphors Ca8MgR(PO4)7:Eu2+,Mn2+ or CaMg:EM (R = La, Y), and thoroughly analyzed the crystalline arrangement, photoluminescence (PL), PL excitation (PLE), as well as the degrading period. The findings suggest that Ca8MgLa(PO4)7:Eu2+,Mn2+ could be a green contender to be used within close ultraviolet-chip white light-emitted diode (WLED) devices. It is possible to change the emitting green hue from Ca8MgLa1-xYx(PO4)7 treated with Eu2+ to cyan by adjusting the La3+/Y3+ proportion for the purpose of lowering the crystal field potency. Furthermore, power shift among Eu2+ and Mn2+ would be used to create a conventional one-stage white CaMg:EM having a CIE hue coordinate shown as (0.330, 0.328). The power transmission process was shown in the form of resonant dipole-quadrupole nature. In addition, we also computed the critical range. The white-emitting single-composition CaMg:EM was effectively coated above one close ultraviolet chip under 375 nm, indicating that it may become a strong choice of phosphor within close ultraviolet WLED devices.

Keywords

• color homogeneity
• double-layer phosphor
• luminous flux
• monte carlo theory
• wled