Narrowed bandgaps and stronger excitonic effects from small boron nitride nanotubes

被引：27

作者：

Yu, Jun ^{[2
]}

Yu, Dehong ^{[3
]}

Chen, Ying ^{[1
]}

Chen, Hua ^{[1
]}

Lin, Meng-Yeh ^{[4
]}

Cheng, Bing-Ming ^{[4
]}

Li, Jia ^{[5
]}

Duan, Wenhui ^{[5
]}

机构：

[1] Deakin Univ, Inst Technol Res & Innovat, Geelong, Vic 3217, Australia

[2] Australian Natl Univ, Res Sch Phys Sci & Engn, Canberra, ACT 0200, Australia

[3] Australian Nucl Sci & Technol Org, Bragg Inst, Lucas Height, NSW 2234, Australia

[4] Natl Synchrotron Radiat Res Ctr, Hsinchu, Taiwan

[5] Tsinghua Univ, Dept Phys, Beijing 100084, Peoples R China

来源：

CHEMICAL PHYSICS LETTERS | 2009年 / 476卷 / 4-6期

基金：

澳大利亚研究理事会;

关键词：

PHOTOLUMINESCENCE; SPECTROSCOPY;

D O I：

10.1016/j.cplett.2009.06.012

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The bandgap of boron nitride nanotubes (BNNTs) is generally considered to be independent on tube radius and chirality. However, we have observed that the bandgaps of BNNTs do depend on the tube size. Photoluminescence excitation spectroscopy with variable photon energies in vacuum ultraviolet (VUV) range revealed that the bandgap becomes smaller when the tube diameter decreases. This is consistent with red-shifted luminescent emissions. The strong interactions between excitons and phonons are possibly responsible for the bandgap narrowing as the function of nanotube size. (C) 2009 Elsevier B. V. All rights reserved.

引用

页码：240 / 243

页数：4

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