Luminescence and Energy Transfer of Novel Dy3+/Eu3+ Co-doped Na2O-CaO-P2O5-B2O3-ZrO2 Nanocrystal Glasses

In order to develop glass-ceramic materials capable of emitting neutral white light and to address the limitations of single rare earth element ion-doped luminescent materials, a glass-ceramic material containing Dy 3+ /Eu 3+ -co-doped NaCaPO 4 nanocrystals was successfully synthesized using the melt-quenching and two-step crystallization methods. The prepared glass-ceramic materials were characterized by X-ray diffraction, transmission electron microscopy, and photoluminescence spectroscopy. The energy transfer process between Dy 3+ and Eu 3+ ions was confirmed through excitation spectra, emission spectra, and luminescence decay curves. The emission coordinates and correlated color temperatures of samples with different doping concentrations were calculated using the standard CIE 1931 colorimetric system. The results showed that coordinated emission was achieved in the glass-ceramic containing NaCaPO 4 nanocrystals under excitation at 363 nm. Furthermore, by adjusting the concentration ratio of Dy 3+ and Eu 3+ ions, the color temperature of the white light emission could be tuned from 9910 K to 5349 K, enabling modification of the emission color from the cool-white region to the pure-white region, with chromaticity coordinates reaching (0.3350, 0.3040). Additionally, the material exhibited high thermal stability, with an activation energy of 0.18649 eV. It is expected that the Dy 3+ /Eu 3+ -co-doped NaCaPO 4 glass-ceramic studied here has broad prospects for applications in white light-emitting diodes.