X-ray radiation excited ultralong (>20,000 seconds) intrinsic phosphorescence in aluminum nitride single-crystal scintillators

• Published in: Nature communications 2020-08, Vol.11 (1), p.4351-4351, Article 4351
• Main Authors: Lin, Richeng, Zheng, Wei, Chen, Liang, Zhu, Yanming, Xu, MengXuan, Ouyang, Xiaoping, Huang, Feng
• Format: Article
• Language: English
• Subjects: 119/118; 140/125; 140/133; 140/146; 639/166/987; 639/301/1019; Aluminum; Aluminum nitride; Crystals; Dosimeters; Dosimetry; Emission analysis; Emission spectra; Emissions; Excitation; Humanities and Social Sciences; Information storage; Inorganic materials; multidisciplinary; Organic chemistry; Phosphorescence; Photons; Rare earth elements; Science; Science (multidisciplinary); Scintillation counters; Single crystals; X-rays
• ISSN: 2041-1723; 2041-1723
• DOI: 10.1038/s41467-020-18221-1

Phosphorescence is a fascinating photoelectronic phenomenon usually observed in rare-earth-doped inorganic crystals and organic molecular crystals, owning great potential in optical information storage, color display and biological dosimetry. Here, we present an ultralong intrinsic phosphorescence (>20,000 seconds) in AlN single-crystal scintillator through X-ray excitation. We suggest that the long afterglow emission originates from the intra-band transition related to native nitrogen vacancy. Some excited states formed by absorbing X-ray photons cannot satisfy the parity difference between initial and final states required by transition selection rule, so they cannot return to the ground state directly through radiation transitions but through several phonon-assisted intra-band transitions slowly. During this process, a long-term broad-spectra phosphorescence emission is formed. Investigating the X-ray excited phosphorescence emission in the AlN is of great significance to understanding the mechanism of phosphorescence in inorganic materials, and to realizing the practical applications in high-energy ray dosimetry. Phosphorescence emission from extrinsic rare-earth element and organic component remains a challenge. Here, the authors demonstrate an ultraviolet ultralong intrinsic phosphorescence (UIP, >20,000 seconds) in aluminum nitride (AlN) single-crystal scintillator through X-ray excitation.