Photoluminescence and temperature-dependent luminescence of Ca5(PO4)3OH doped Eu3+phosphors

In most hosts, the electric dipole transition (EDT) of Eu3+ is usually more intense than the magnetic dipole transition (MDT); however, this is not the case with Ca5(PO4)3OH. Herein, Ca5(PO4)3OH was doped with different Eu3+ concentrations to obtain the maximum emission intensity. The X-ray powder diffraction confirmed that the material crystallised in a single hexagonal Ca5(PO4)3OH phase. The photoluminescence showed two prominent peaks at 573 and 628 nm ascribed to the 5D0-7F1 (MDT) and 5D0-7F2 (EDT) of Eu3+, respectively. The luminescence intensities of the MDT and EDT were comparable when excited with a 305 nm xenon lamp, but when excited with a 325 nm Cd-He laser, the luminescence intensity of the MDT surpassed that of the EDT. The International Commission on Illumination chromaticity coordinates diagram showed that the material emitted a red-orange colour, suggesting it's potential application in red-orange colour displays. The temperaturedependent luminescence was measured, and the relative temperature sensitivities were determined in four different wavelength ranges, suggesting this material's potential application in luminescence thermometry.

Automated summary

In this study, Ca5(PO4)3OH doped with different concentrations of Eu3+ was found to exhibit maximum emission intensity. The luminescence properties of the material were influenced by the excitation wavelength, and temperature-dependent luminescence was observed within specific wavelength ranges. These findings suggest potential applications of this material in displays and luminescence thermometry.