Intense ultraviolet and green photoluminescence from sol-gel derived silica containing hydrogenated carbon

被引:27
作者
He, HP [1 ]
Wang, YX [1 ]
Tang, HG [1 ]
机构
[1] Univ Sci & Technol China, Dept Mat Sci & Engn, Hefei 230026, Peoples R China
关键词
D O I
10.1088/0953-8984/14/45/328
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
Intense ultraviolet and green room-temperature photoluminescence (PL) at 335, 370 and 500 nm was observed in C-doped silica synthesized by a sol-gel process using tetraethoxysilane as the precursor and glucose as the carbon source, followed by thermal treatment at temperatures from 400 to 900 degreesC in air and ambient N-2. The 335 nm emission was accompanied by a shoulder at 325 nm which originated from nonbridging oxygen hole centres (dropSi-O.). The 370 nm emission may correlate with the Si-O-C species formed by dropSi-O. defects and carbon atoms. The 500 nm band results from hydrogenated carbon embedded in silica which mainly derived from the decomposition of glucose. Moreover, the green PL exhibited a vibrational structure with a peak spacing of about 1360 cm(-1) when the sample was heated at 800 degreesC in N-2; this can be assigned to a vibronic coupling process involved in radiative electronic transitions in the hydrogenated carbon. Both the 370 and 500 nm PL emissions disappeared when the sample was heated above 600 degreesC in air, indicating oxidative decomposition of the light-emitting species in the material.
引用
收藏
页码:11867 / 11874
页数:8
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