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Article: Correlation of quantum efficiency and photoluminescence lifetime of ZnO tetrapods grown at different temperatures

TitleCorrelation of quantum efficiency and photoluminescence lifetime of ZnO tetrapods grown at different temperatures
Authors
KeywordsII-VI semiconductors
Nanofabrication
Nanoparticles
Photoluminescence
Semiconductor growth
Issue Date2012
PublisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jsp
Citation
Journal of Applied Physics, 2012, v. 112 n. 2, article no. 023515 How to Cite?
AbstractAbsolute external quantum efficiencies (ηs) and photoluminescence (PL) decay lifetimes of ZnO tetrapods grown at different temperatures were measured. All the tetrapods had an UV peak at about 390 nm and a very weak defect emission. Measurements showed that the tetrapods have ηs of 2%-4% at room temperature. The sample, grown at optimal temperature, exhibited the largest absolute η of 4.3% and longest PL decay lifetimes among all the samples. These results showed that precise control of growth temperature plays an important role in making high quality ZnO tetrapods. In time-resolved measurement, the PL decay time constant (τ) versus temperature is well fitted by the theoretical prediction τ = a . This increase in PL lifetime with increasing temperature shows that the excited state relaxation is dominated by radiative recombination.
Persistent Identifierhttp://hdl.handle.net/10722/161507
ISSN
2015 Impact Factor: 2.101
2015 SCImago Journal Rankings: 0.603
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorTam, MC-
dc.contributor.authorNg, AMC-
dc.contributor.authorDjurisic, AB-
dc.contributor.authorWong, KS-
dc.date.accessioned2012-08-30T03:26:47Z-
dc.date.available2012-08-30T03:26:47Z-
dc.date.issued2012-
dc.identifier.citationJournal of Applied Physics, 2012, v. 112 n. 2, article no. 023515-
dc.identifier.issn0021-8979-
dc.identifier.urihttp://hdl.handle.net/10722/161507-
dc.description.abstractAbsolute external quantum efficiencies (ηs) and photoluminescence (PL) decay lifetimes of ZnO tetrapods grown at different temperatures were measured. All the tetrapods had an UV peak at about 390 nm and a very weak defect emission. Measurements showed that the tetrapods have ηs of 2%-4% at room temperature. The sample, grown at optimal temperature, exhibited the largest absolute η of 4.3% and longest PL decay lifetimes among all the samples. These results showed that precise control of growth temperature plays an important role in making high quality ZnO tetrapods. In time-resolved measurement, the PL decay time constant (τ) versus temperature is well fitted by the theoretical prediction τ = a . This increase in PL lifetime with increasing temperature shows that the excited state relaxation is dominated by radiative recombination.-
dc.languageeng-
dc.publisherAmerican Institute of Physics. The Journal's web site is located at http://jap.aip.org/jap/staff.jsp-
dc.relation.ispartofJournal of Applied Physics-
dc.rightsJournal of Applied Physics. Copyright © American Institute of Physics.-
dc.rightsCopyright (2012) American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in (Journal of Applied Physics, 2012, v. 112 n. 2, article no. 023515) and may be found at (http://jap.aip.org/resource/1/japiau/v112/i2/p023515_s1).-
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectII-VI semiconductors-
dc.subjectNanofabrication-
dc.subjectNanoparticles-
dc.subjectPhotoluminescence-
dc.subjectSemiconductor growth-
dc.titleCorrelation of quantum efficiency and photoluminescence lifetime of ZnO tetrapods grown at different temperaturesen_US
dc.typeArticleen_US
dc.identifier.emailNg, AMC: alanalfa@hku.hk-
dc.identifier.emailDjurisic, AB: dalek@hku.hk-
dc.identifier.emailWong, KS: phkswong@ust.hk-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1063/1.4737785-
dc.identifier.hkuros206177-
dc.identifier.volume112-
dc.identifier.issue2, article no. 023515-
dc.identifier.isiWOS:000308424500038-
dc.publisher.placeUnited States-

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