Preparation and luminescent properties of Tm3+-Dy3+ co-doped phosphate glass for white light-emitting-diode applications

Abstract As a kind of rare earth luminescent material, the development of white light-emitting glass cannot be ignored. Here, we successfully prepared series of Tm3+-Dy3+ co-doped P2O5-SrO-BaO-ZnO glasses. Structural analysis showed that the glass network is mainly composed of orthophosphate, pyrophosphate, and metaphosphate units. In the case of a certain content of Tm3+ or Dy3+, the densities of PSBZ glasses increased with the increasing of Dy3+ or Tm3+ content. From the optical absorption spectra, eight distinctive absorption bands can be found in the wavelength of 300 nm–750 nm. Under the excitation of 354 nm UV light, four main peaks corresponded to the transition of 1D2 → 3F4 and 4F9/2 → 6HJ (J = 15/2, 13/2 and 11/2) were found at 452 nm, 483 nm, 574 nm, and 663 nm, respectively. Besides, the CIE chromaticity coordinates, CCTs, and fluorescence decay curves were recorded to confirm the glass Tm0.4Dy1.0 showed excellent chromaticity coordinates (0.3392, 0.3334), suitable CCT (5188K) and relatively high fluorescence lifetime (434.68 μs) compared to other glasses prepared in this work, indicating that this glass has potential applications in WLED devices.