Probing defects in ZnO by persistent phosphorescence
Journal Title: Opto-Electronic Advances - Year 2018, Vol 1, Issue 6
Abstract
Native point defects in ZnO are so complicated that most of them are still debating issues, although they have been studied for decades. In this paper, we experimentally reveal two sub-components usually hidden in the low energy tail of the main broad green luminescence band peaking at 547 nm (~2.267 eV) in intentionally undoped ZnO single crystal by selecting the below-band-gap (BBG) optical excitations (e.g. light wavelengths of 385 nm and 450 nm). Moreover, both sub-components are manifested as long persistent phosphorescence once the BBG excitations are removed. With the aid of a newly developed model, the energy depths of two electron traps involved within the long lived orange luminescence are determined to be 44 meV and 300 meV, respectively. The candidates of these two electron traps are argued to be most likely hydrogen and zinc interstitials in ZnO.
Authors and Affiliations
Honggang Ye, Zhicheng Su, Fei Tang, Yitian Bao, Xiangzhou Lao, Guangde Chen, Jian Wang, Shijie Xu*
Keywords
Related Articles
- EP ID EP683089
- DOI 10.29026/oea.2018.180011
- Views 192
- Downloads 0
Speckle reduction using phase plate array and lens array
In this paper, a solution for speckle reduction using phase plate array (PPA) and lens array (LA) in a motionless way is proposed. The specially designed PPA is composed of sub-phase plates, which are constituted by phas...
Imaging the crystal orientation of 2D transition metal dichalcogenides using polarization-resolved second-harmonic generation
We use laser-scanning nonlinear imaging microscopy in atomically thin transition metal dichalcogenides (TMDs) to reveal information on the crystalline orientation distribution, within the 2D lattice. In particular, we pe...
Sensing and lasing applications of whispering gallery mode microresonators
Optical whispering gallery mode (WGM) microresonators have attracted great attention due to their remarkable properties such as extremely high quality factor, small mode volume, tight confinement of modes, and strong eva...
Iterative freeform lens design for prescribed irradiance on curved target
Current freeform illumination optical designs are mostly focused on producing prescribed irradiance distributions on planar targets. Here, we aim to design freeform optics that could generate a desired illumination on a...
Recent improvement of silicon absorption in opto-electric devices
Silicon dominates the contemporary electronic industry. However, being an indirect band-gap material, it is a poor absorber of light, which decreases the efficiency of Si-based photodetectors and photovoltaic devices. Th...