Ambipolar charge transport and electroluminescence properties of ZnO nanorods

Wong, Chun-Yuen; Lai, Lo-Ming; Leung, Siu-Ling; Roy, V. A. L.; Pun, Edwin Yue-Bun

doi:10.1063/1.2957671

Cited by 18 publications

(5 citation statements)

References 33 publications

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“…More recently, photoluminescence ͑PL͒, electroluminescence ͑EL͒, cathodoluminescence ͑CL͒, and magnetic properties were investigated in undoped and Mn-doped ZnO nanowires and nanorods. [18][19][20] PL, EL, and CL emitted in the visible region were observed and were attributed to the ionized oxygen vacancies.…”

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confidence: 98%

Magnetophotoluminescence properties of Co-doped ZnO nanorods

Lin

Wang

Lee

et al. 2009

Applied Physics Letters

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We present the detailed experimental results of the magnetic and optical properties of cobalt doped ZnO nanorods, especially the temperature and magnetic field dependence of photoluminescence up to 14 T. The Raman measurements indicate that our Co-doped ZnO nanorods have the same lattice constant as crystalline bulk ZnO. Sharp luminescence peaks centered at around 670 nm were observed at low temperature and their intensity decreased with increasing magnetic field. The luminescence peaks were attributed to d-d transitions in the Ligand field from the doped Co ions. We also observed a diamagnetic shift at a temperature of 1.5 K when the magnetic field was scanned from 0 to 14 T. The exciton radius of the Co-doped ZnO nanorods was deduced from the magnetophotoluminescence results

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confidence: 98%

Magnetophotoluminescence properties of Co-doped ZnO nanorods

Lin

Wang

Lee

et al. 2009

Applied Physics Letters

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“…Zinc oxide (ZnO) has attracted much attention as a solid-state lighting source with potential advantages over the III-nitride system due to the high exciton binding energy. In particular, ZnO nanostructures are very attractive for the possibility of their growth on alien substrates without the need for of lattice matching and utilizing various growth methods such as electron beam evaporation [1], spray pyrolysis [2], the solvothermal method [3], the sol-gel template method [4], hydrothermal decomposition [5], and so on.…”

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confidence: 99%

White-light electroluminescence from ZnO nanorods/polyfluorene by solution-based growth

et al. 2009

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We report bright white-light electroluminescence (EL) from a diode structure consisting of a ZnO nanorod (NR) and a p-type conducting polymer of poly(fluorine) (PF) fabricated using a hydrothermal method. ZnO NRs are successfully grown on an organic layer of PF using a modified seeding layer. The EL spectrum shows a broad emission band covering the entire visible range from 400 to 800 nm. White-light emission is possible because the ZnO-defect-related emission from the ZnO NR/PF heterostructure is enhanced to become over thousand times stronger than that from the usual ZnO NR structure. This strong green-yellow emission associated with the ZnO defects, combined with the blue PF-related emission, results in the white-light emission. Enhancement of the ZnO-defect emission is caused by the presence of Zn(OH)(2) at the interface between the ZnO NRs and PF. Fourier transform infrared spectroscopy reveals that the absorption peaks at 3441, 3502, and 3574 cm(-1) corresponding to the OH group are formed at the ZnO NR/PF heterostructure, which confirms the enhancement of defect emission from the ZnO NR/PF heterostructure. The processing procedure revealed in this work is a convenient and low-cost way to fabricate ZnO-based white-light-emitting devices.

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“…9. ZnO nanorods prepared by solution method with bipolar charge transport properties 25 can be used as the hole transport layer. Holes injected from the ITO electrode move to the MOPPV film to recombine with the electrons injected from the cathode.…”

Section: Resultsmentioning

confidence: 99%

Bicolor Light-Emitting Diode Based on Zinc Oxide Nanorod Arrays and Poly(2-methoxy,5-octoxy)-1,4-phenylenevinylene

Song

Chen

et al. 2011

Journal of Elec Materi

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The current study reports a novel inorganic/organic light-emitting diode (LED), consisting of zinc oxide (ZnO) nanorod arrays and poly(2-methoxy, 5-octoxy)-1,4-phenylenevinylene (MOPPV). ZnO nanorod arrays passivated using polyacrylamide (PAM) with 70 nm diameter were successfully prepared by a simple polymer-assisted chemical method. Enhancement of the ZnO defect emission is caused by PAM passivation, as observed in photoluminescence spectra. Infrared absorption spectra reveal that PAM is chemically or physically adsorbed on the surfaces of ZnO nanorod arrays. The electroluminescence (EL) spectrum shows bluish light at 406 nm from ZnO transition emission, and light emission with center at 600 nm from exciton emission in MOPPV. The potential EL mechanism is electron transition to zinc vacancy in PAM/ZnO nanorod arrays, and exciton radiation luminescence in MOPPV film. This novel PAM/ZnO-MOPPV device may be helpful to promote development of multicolor LEDs.

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Ambipolar charge transport and electroluminescence properties of ZnO nanorods

Cited by 18 publications

References 33 publications

Magnetophotoluminescence properties of Co-doped ZnO nanorods

Magnetophotoluminescence properties of Co-doped ZnO nanorods

White-light electroluminescence from ZnO nanorods/polyfluorene by solution-based growth

Bicolor Light-Emitting Diode Based on Zinc Oxide Nanorod Arrays and Poly(2-methoxy,5-octoxy)-1,4-phenylenevinylene

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