A Thermal Stable Multi‐Functional Cu + ‐doped Glass for High‐Resolution X‐Ray Imaging and Full‐Spectra Lighting

Abstract Luminescent glass materials have emerged as promising light emitters due to their low cost, simple process, and excellent stability. Designing glass scintillators for high‐temperature applications remains a challenge. In this paper, Cu + ‐doped glass with extraordinary photoluminescence (PL) and X‐ray excited luminescence (XEL) properties, and outstanding thermal stability is designed by using oxyfluoride glass as host components, introducing Al as a reducing agent, and energy transfer from traps to Cu + . For glass scintillators, the optimal glass exhibits a remarkable integrated XEL intensity (425% of that of Bi 4 Ge 3 O 12 (BGO)). Its imaging resolution reaches 20 lp mm −1 . Its XEL intensity at 573 K is 66% of that at 303 K, far exceeding that of CsI:Tl and BGO at 573 K (0.6% and 1.5%, respectively). The outstanding thermal stability helps glass scintillators achieve high‐resolution imaging at high temperatures. For white light‐emitting diode (WLED) phosphors, the optimal glass exhibits extraordinary external quantum efficiency (80.1%) and zero‐thermal‐quenching luminescence (99.9% at 453 K). By combining Cu + ‐doped glass with a UV chip and commercial phosphors, a full‐spectra WLED with a color rendering index of 94.4 is obtained. The above results suggest that Cu + ‐doped oxyfluoride glass has the potential as efficient blue‐cyan emitter for scintillator used at high temperatures and blue‐cyan component in full‐spectra lighting.