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Electrochemically Grown ZnO Vertical Nanowire Scintillator with Light‐Guiding Effect
Author(s) -
Izaki Masanobu,
Kobayashi Masakazu,
Shinagawa Tsutomu,
Koyama Takayuki,
Uesugi Kentaro,
Takeuchi Akihisa
Publication year - 2017
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201700285
Subject(s) - scintillator , materials science , photoluminescence , nanowire , optoelectronics , ultraviolet , zinc nitrate , ultraviolet light , exciton , substrate (aquarium) , light intensity , zinc , nanotechnology , optics , physics , oceanography , quantum mechanics , detector , metallurgy , geology
The <0001>‐oriented ZnO vertical nanowires (vnws) have been prepared by electrochemical growth for the electric charge of 0.3, 0.7, and 1.5 Ccm −2 on a <0001>‐Ga:ZnO/soda‐lime glass substrate in an simple aqueous 0.8 mmol L −1 zinc nitrate hydrate solution. All the ZnO‐vnws emitted strong ultraviolet light that originated from the recombination of a bound exciton and weak visible light due to native defects. The best performance regarding the intensity ratio and ultraviolet light intensity was obtained for the ZnO‐vnws prepared for 0.7 Ccm −2 , and the performance changed depending on the electric charge. The ZnO‐vnws also showed the best scintillator performance with the luminous efficiency of 8.3% and spatial resolution of 4 μm, and the scintillator performance was closely related to the light‐guiding effects originating from the nanowire dimension in addition to the photoluminescence characteristic.