Please use this identifier to cite or link to this item:
Title: Realizing a SnO2-based ultraviolet light-emitting diode via breaking the dipole-forbidden rule
Authors: Li, Yongfeng
Yin, Wanjian
Deng, Rui
Chen, Rui
Chen, Jing
Yan, Qingyu
Yao, Bin
Sun, Handong
Wei, Su-Huai
Wu, Tom
Issue Date: 2012
Source: Li, Y., Yin, W., Deng, R., Chen, R., Chen, J., Yan, Q., et al. (2012). Realizing a SnO2-based ultraviolet light-emitting diode via breaking the dipole-forbidden rule. NPG Asia Materials, 4, e30-.
Series/Report no.: NPG Asia materials
Abstract: Although many oxide semiconductors possess wide bandgaps in the ultraviolet (UV) regime, currently the majority of them cannot efficiently emit UV light because the band-edge optical transition is forbidden in a perfect lattice as a result of the symmetry of the band-edge states. This quantum mechanical rule severely constrains the optical applications of wide-bandgap oxides, which is also the reason why so few oxides enjoy the success of ZnO. Here, using SnO2 as an example, we demonstrate both theoretically and experimentally that UV photoluminescence and electroluminescence can be recovered and enhanced in wide-bandgap oxide thin films with ‘forbidden’ energy gaps by engineering their nanocrystalline structures. In our experiments, the tailored low-temperature annealing process results in a hybrid structure containing SnO2 nanocrystals in an amorphous matrix, and UV emission is observed in such hybrid SnO2 thin films, indicating that the quantum mechanical dipole-forbidden rule has been effectively overcome. Using this approach, we demonstrate the first prototypical electrically pumped UV-light-emitting diode based on nanostructured SnO2 thin films.
ISSN: 1884-4057
DOI: 10.1038/am.2012.56
Rights: © 2012 The Author(s) (Nature Publishing Group). This work is licensed under the Creative Commons Attribution-NonCommercial-No Derivative Works 3.0 Unported License. To view a copy of this license, visit
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:MSE Journal Articles
SPMS Journal Articles

Google ScholarTM



Items in DR-NTU are protected by copyright, with all rights reserved, unless otherwise indicated.