Eu2+ doped halide perovskite KCaCl3 with high-efficiency blue emission and scintillation application
Doping engineering in lead-free all-inorganic halide perovskites plays an important role in their performance modulation for emerging photonics applications. Benefiting from the weak electron phonon coupling effect, and the distorted site occupied by Eu2+, chloride perovskite phosphor KCaCl3 : Eu2+ is prepared and demonstrated herein, which shows high-efficiency (internal quantum efficiency, IQE = 96.1%) blue emission peaking at ∼430 nm as well as good thermal stability (74%@ 423 K of the initial integrated intensity at 298 K). This phosphor also has high radiation luminescence intensity (∼7.1 times that of commercial Lu3Al5O12 : Ce3+) upon X-ray excitation and a low detection limit (483.5 nGyair s−1), exhibiting good potential in X-ray detection and imaging. This work provides new insights into the design of Eu2+ activated halide perovskite luminescent materials for versatile optoelectronic applications.
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