Long lasting phosphorescence in oxygen-deficient zinc–boron-germanosilicate glass–ceramics

• Published in: Journal of alloys and compounds Vol. 504; no. 1; pp. 177 - 180
• Main Authors: Lin, Geng, Dong, Guoping, Tan, Dezhi, Liu, Xiaofeng, Zhang, Qiang, Chen, Danping, Qiu, Jianrong, Zhao, Quanzhong, Xu, Zhizhan
• Format: Journal Article
• Language: English
• Published: Kidlington Elsevier B.V 13.08.2010; Elsevier
• Subjects: Afterglows; Alloys; Amorphous materials, glasses and other disordered solids; Approximation; Condensed matter: electronic structure, electrical, magnetic, and optical properties; Decay; Electron paramagnetic resonance; Electron paramagnetic resonance and relaxation; Electron spin resonance; Exact sciences and technology; Ge-related oxygen-deficient centers; Glass ceramics; Glass–ceramic; Long lasting phosphorescence; Magnetic resonances and relaxations in condensed matter, mössbauer effect; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Phosphorescence; Photoluminescence; Physics; Long lasting phosphorescence; Ge-related oxygen-deficient centers; Glass–ceramic; Radiation effects; Band structure; Paramagnetic center; Tunnel effect; Germanates; Silicates; Nonstoichiometry; Charge carrier trapping; Glass-ceramic; Ultraviolet irradiation; Quaternary systems; Illumination; Zinc oxide; Phosphorescence; Electron paramagnetic resonance; Glass ceramics; Long lasting; Germanosilicate glass; Borates; Glow discharges
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2010.05.080

Long lasting phosphorescence has been observed in oxygen-deficient zinc–boron-germanosilicate glass–ceramics after 254 nm ultraviolet lights irradiation at room temperature. Electron spin resonance (ESR) spectrum confirms the presence of two paramagnetic centers. And the ESR signal shows a synchronized decay process with afterglow intensity after removing the excitation light, suggesting the afterglow is associated with the paramagnetic centers which are generated during the irradiation. Based on the approximate t −1 decay law of the phosphorescence intensity, the long lasting phosphorescence is attributed to thermal assisted tunneling recombination between pairs of distant electrons and Ge-related oxygen-deficient centers.