Double Gain of Efficient UV‐C Phosphor and Fast Scintillator Based on Pr 3+ ‐doped KY 3 F 10 Nano‐Glass Composites

Glassy phosphors offer a promising opportunity to overcome the limits of polycrystalline counterparts, thanks to their merits including excellent optical transparency, abandonment of organic binders, and capability of drawing fibers, etc. However, research and development of glassy UV‐C phosphors and fast scintillators have seriously lagged behind crystals. Here, a new type of efficient UV‐C phosphors and fast scintillators (double gain) is developed from Pr 3+ ‐doped transparent nano‐glass composites (nano‐GCs) containing KY 3 F 10 nanocrystals. Such a material combines favorably the advantages of both crystal and glass, exhibiting intense interconfigurational 5 d ‐4 f emissions of Pr 3+ upon deep‐UV, high energy electron‐beam and X‐ray excitations. The emission profile ideally overlaps with the germicidal effectiveness curve. The Pr 3+ ‐doped nano‐GCs are endowed with a radiative decay time shorter than that of extensively studied Ce 3+ ‐doped glasses and nano‐GCs. They exhibit intense X‐ray excited radioluminescence that is comparable to the standard Bi 4 Ge 3 O 12 (BGO) crystal and significantly stronger than Pr 3+ ‐doped ZBLAN fluoride glass known for the high luminescence efficiency. An X‐ray imaging system with a good spatial resolution using the Pr 3+ ‐doped nano‐GCs is also demonstrated.