Time-resolved luminescence of TiO2 powders with different crystal structures

被引：28

作者：

Harada, Naomi ^{[1
]}

Goto, Masako ^{[1
]}

Iijima, Koji ^{[1
]}

Sakama, Hiroshi ^{[1
]}

Ichikawa, Noriya ^{[1
]}

Kunugita, Hideyuki ^{[1
]}

Ema, Kazuhiro ^{[1
]}

机构：

[1] Sophia Univ, Dept Phys, Tokyo 10285524, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2007年 / 46卷 / 7A期

关键词：

TiO2; time-resolved photoluminescence; relaxation process; self-trapped exciton;

D O I：

10.1143/JJAP.46.4170

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The dynamics of photoexcited carriers in standard TiO2 photocatalytic powders has been studied by investigating the time decay and temperature dependence of the photoluminescence. A biexponential decay curve in a time-resolved signal suggests that there are different formation processes of the self-trapped exciton states. The peak position of the luminescence spectrum shifted to a higher energy at room temperature. On the basis of these experimental results, we propose a relaxation model of photoexcited carriers.

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收藏

页码：4170 / 4171

页数：2

相关论文

共 14 条

[1] Visible-light photocatalysis in nitrogen-doped titanium oxides [J].

Asahi, R ;

Morikawa, T ;

Ohwaki, T ;

Aoki, K ;

Taga, Y .

SCIENCE, 2001, 293 (5528) :269-271

[2] Effects of sputtering atmosphere oxygen pressure on photocatalytic phenomena in anatase films [J].

Fukami, T ;

Naruoka, T ;

Momose, T ;

Bamba, N .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS, 2002, 41 (7A) :L794-L796

[3] Charge carrier dynamics of standard TiO2 catalysts revealed by femtosecond diffuse reflectance spectroscopy [J].

Furube, A ;

Asahi, T ;

Masuhara, H ;

Yamashita, H ;

Anpo, M .

JOURNAL OF PHYSICAL CHEMISTRY B, 1999, 103 (16) :3120-3127

[4] Explaining the enhanced photocatalytic activity of Degussa P25 mixed-phase TiO2 using EPR [J].

Hurum, DC ;

Agrios, AG ;

Gray, KA ;

Rajh, T ;

Thurnauer, MC .

JOURNAL OF PHYSICAL CHEMISTRY B, 2003, 107 (19) :4545-4549

[5] TIME-RESOLVED SPECTROSCOPY OF THE VISIBLE EMISSION BAND IN STRONTIUM-TITANATE [J].

LEONELLI, R ;

BREBNER, JL .

PHYSICAL REVIEW B, 1986, 33 (12) :8649-8656

[6] Green and ultraviolet emissions from anatase TiO2 films fabricated by chemical vapor deposition [J].

Najafov, H ;

Tokita, S ;

Ohshio, S ;

Kato, A ;

Saitoh, H .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS, 2005, 44 (1A) :245-253

[7] TUNNELING PROCESS FROM FREE STATE TO SELF-TRAPPED STATE OF EXCITON [J].

NASU, K ;

TOYOZAWA, Y .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1981, 50 (01) :235-245

[8] Comparison of the photoelectronic and photocatalytic activities of various anatase and rutile forms of titania in pure liquid organic phases and in aqueous solutions [J].

Sclafani, A ;

Herrmann, JM .

JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (32) :13655-13661

[9] Role of platinum deposited on TiO2 in phenol photocatalytic oxidation [J].

Sun, B ;

Vorontsov, AV ;

Smirniotis, PG .

LANGMUIR, 2003, 19 (08) :3151-3156

[10] PHOTOLUMINESCENCE IN TIO2 ANATASE SINGLE-CRYSTALS [J].

TANG, H ;

BERGER, H ;

SCHMID, PE ;

LEVY, F ;

BURRI, G .

SOLID STATE COMMUNICATIONS, 1993, 87 (09) :847-850