Journal
ADVANCED MATERIALS
Volume 31, Issue 44, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201904711
Keywords
lead free halides; photoluminescence quantum yield (PLQY); scintillators
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Funding
- National Natural Science Foundation of China [51761145048, 61725401, 51702107, 11674237, 51602211]
- Major State Basic Research Development Program of China [2016YFB0700702]
- China Postdoctoral Science Foundation [2018M642825]
- WNLO
- Natural Science Foundation of Jiangsu Province of China [BK20160299]
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Scintillators are widely utilized for radiation detections in many fields, such as nondestructive inspection, medical imaging, and space exploration. Lead halide perovskite scintillators have recently received extensive research attention owing to their tunable emission wavelength, low detection limit, and ease of fabrication. However, the low light yields toward X-ray irradiation and the lead toxicity of these perovskites severely restricts their practical application. A novel lead-free halide is presented, namely Rb2CuBr3, as a scintillator with exceptionally high light yield. Rb2CuBr3 exhibits a 1D crystal structure and enjoys strong carrier confinement and near-unity photoluminescence quantum yield (98.6%) in violet emission. The high photoluminescence quantum yield combined with negligible self-absorption from self-trapped exciton emission and strong X-ray absorption capability enables a record high light yield of approximate to 91056 photons per MeV among perovskite and relative scintillators. Overall, Rb2CuBr3 provides nontoxicity, high radioluminescence intensity, and good stability, thus laying good foundations for potential application in low-dose radiography.
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