Self-Crystallized Ba2LaF7 Glass Ceramics with High Thermal-Stability for White Light-Emitting-Diodes and Field Emission Displays

Thermal management is still a significant challenge for high-power phosphor-converted white light-emitting-diodes (pc-WLEDs), which discourages their promising application as future general lighting. High junction temperature of light-emitting-diodes (LED) chips inevitably causes serious degradation of luminous efficiency and deteriorates WLEDs output properties. Here, the silicate glass embedded with Ba2LaF7: 35Eu3+/Eu2+, 20Tb3+ (BLF: Eu3+/Eu2+, Tb3+) nano-particles by the self-crystallized growth process achieves a low scattering loss, high luminous efficiency, good thermal stability, and the spectral chromaticity coordinate of which locates in white region even at 573 K. Moreover, this glass ceramics exhibit high transparency under UV-Chip-On-Board (UV-COB) excitation after thermal aging for 384 h. Hence, a thermal-stable organic-resin-free WLED device combined the self-crystallized BLF: Eu3+/Eu2+, Tb3+ glass ceramics with a UV-COB is achieved. Additionally, the cathodeluminescence (CL) spectra as a function of accelerating voltage and probe current indicate the excellent degradation resistance properties with good color stability of the as-obtained glass ceramics. Our results demonstrate unambiguously that the self-crystallized BLF: Eu3+/Eu2+, Tb3+ glass ceramics could serve as a bi-functional promising candidate for high-power WLEDs and field emission displays (FEDs).