Optical properties of polyvinyl alcohol (PVA) coated In2O3 nanoparticles

► Enhanced UV–blue emission and suppressed parasitic green emission has been observed in PVA coated In2O3 nanoparticles. ► PVA can modify surface defect states of In2O3 nanoparticles. ► Mechanisms of suppressed parasitic green emission for PVA coated In2O3 nanoparticles are modeled. An experimental...

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Bibliographic Details
Published in:Optical materials 2013-01, Vol.35 (3), p.563-566
Main Authors: Shao, Dali, Qin, Liqiao, Sawyer, Shayla
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Cross-disciplinary physics: materials science
rheology
Electronics
Emission
Exact sciences and technology
Indium oxide (In2O3) nanoparticles
Indium oxides
Materials science
Nanocrystalline materials
Nanocrystals and nanoparticles
Nanoparticles
Nanoscale materials and structures: fabrication and characterization
Optical properties
Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation
Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures
Optoelectronic devices
Photocurrent
Photoluminescence
Physics
Polyvinyl alcohols
Polyvinyl-alcohol (PVA)
Semiconductor electronics. Microelectronics. Optoelectronics. Solid state devices
Surface passivation
Thin films
UV photodetector
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Summary:► Enhanced UV–blue emission and suppressed parasitic green emission has been observed in PVA coated In2O3 nanoparticles. ► PVA can modify surface defect states of In2O3 nanoparticles. ► Mechanisms of suppressed parasitic green emission for PVA coated In2O3 nanoparticles are modeled. An experimental study of the optical properties of PVA coated In2O3 nanoparticles was performed with characterization methods including photoluminescence, absorption and point source, photogenerated current–voltage measurements. The photoluminescence results show that PVA can suppress the parasitic green emission by modifying defect energy states introduced by oxygen vacancies. Thin films fabricated from PVA coated In2O3 nanoparticles show higher photocurrent and suppressed dark current, which may be promising for UV photodetector applications.
ISSN:0925-3467
1873-1252
DOI:10.1016/j.optmat.2012.10.026