Tb ³⁺ ‐Doped Phosphors‐Based‐Glass Scintillators with Excellent Performance for High‐Temperature X‐Ray Imaging

ABSTRACT Glass scintillators with high transparency, high X‐ray excited luminescence (XEL) intensity, superior thermal stability, excellent irradiation hardness, and ultrahigh spatial resolution have garnered considerable interests. In this paper, based on thermally stable phosphors, we design a novel phosphors‐based‐glass (PBG) scintillators with excellent performance for long‐time X‐ray detection and high‐temperature X‐ray imaging. The developed Tb 3+ ‐doped PBG scintillators with high transparency (86% at 542 nm) exhibit bright green light and high photoluminescence (PL) thermal stability, with PL intensity at 573 K retaining 96.2% of its room‐temperature value. Besides, Tb 3+ ‐doped PBG scintillators possess record‐breaking XEL intensity (404% of that of Bi 4 Ge 3 O 12 (BGO)), excellent irradiation resistance, the lowest detection limit of 2.8 µGy air /s, and ultrahigh spatial resolution of 34 lp/mm. In contrast to commercial BGO and CsI:Tl (XEL intensity at 573 K is 1% of that at 303 K), Tb 3+ ‐doped PBG scintillators demonstrate zero‐thermal‐quenching behavior in XEL, and XEL intensity at 573 K fully retains its room‐temperature value. These findings establish the developed Tb 3+ ‐doped PBG as an exceptionally promising candidate for X‐ray imaging in harsh environments and highlight the PBG strategy as a new avenue for creating highly stable and efficient glass scintillators.