Spectrally tunable white light-emitting diodes based on carbon quantum dot-doped poly(N-vinylcarbazole) composites

buir.contributor.authorMutlugün, Evren
buir.contributor.orcidMutlugün, Evren|0000-0003-3715-5594
dc.citation.epage2752en_US
dc.citation.issueNumber3
dc.citation.spage2744
dc.citation.volumeNumber7
dc.contributor.authorSahin Tiras, Kevser
dc.contributor.authorBiçer, Aysenur
dc.contributor.authorSoheyli, Ehsan
dc.contributor.authorMutlugün, Evren
dc.date.accessioned2024-03-20T07:03:12Z
dc.date.available2024-03-20T07:03:12Z
dc.date.issued2024-01-26
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)
dc.description.abstractElectroluminescent white light-emitting diodes (WLEDs) are always of great interest for emerging display applications. Carbon-based quantum dots (CQDs) are the newest emerging nanoscale materials that can be employed for this purpose, owing to their broad and bright light emission properties. In the present work, highly luminescent CQDs with an emission quantum yield of 60% were prepared via a colloidal solvothermal method and subsequent silica gel column chromatography. The photoluminescence (PL) peak was located at 550 nm possessing yellow emission, with a full width at half-maximum of 98 nm and a relatively long lifetime of 10.23 ns through a single-exponential recombination pathway. CQDs were employed in an electroluminescent device architecture of an ITO/PEDOT:PSS/TFB/CQD:PVK/TPBi/LiF/Al structure and blended with poly(N-vinylcarbazole) (PVK) to evaluate their ability to reach white electroluminescent emission. Results confirmed a high external quantum efficiency (EQE) of 0.76% and a maximum luminescence of 774.3 cd·m-2. Tuning the ratio between CQDs and PVK from 1:10.25 to 1:5.75 resulted in a systematic shift in CIE x-y coordinates from 0.23-0.26 to 0.21-0.24, located close to the cool white region. The results of the present study can be considered a step forward in fabricating efficient WLEDs based on low-cost CQDs.
dc.description.provenanceMade available in DSpace on 2024-03-20T07:03:12Z (GMT). No. of bitstreams: 1 Spectrally_tunable_white_light-emitting_diodes_based_on_carbon_quantum_dot-doped_poly(N-vinylcarbazole)_composites.pdf: 5702495 bytes, checksum: 1d8e935d7643de1451117f9141aedfc0 (MD5) Previous issue date: 2024-01-26en
dc.embargo.release2025-01-26
dc.identifier.doi10.1021/acsanm.3c04915
dc.identifier.eissn2574-0970
dc.identifier.urihttps://hdl.handle.net/11693/115002
dc.language.isoen_US
dc.publisherAmerican Chemical Society
dc.relation.isversionofhttps://dx.doi.org/10.1021/acsanm.3c04915
dc.rightsCC BY-NC-ND 4.0 Deed (Attribution-NonCommercial-NoDerivs 4.0 International)
dc.rights.urihttps://creativecommons.org/licenses/by-nc-nd/4.0/
dc.source.titleACS Applied Nano Material
dc.subjectSolvothermal
dc.subjectCarbon quantum dots
dc.subjectYellow emission
dc.subjectHigh quantum efficiency
dc.subjectElectroluminescence
dc.subjectWhite light-emitting diodes
dc.titleSpectrally tunable white light-emitting diodes based on carbon quantum dot-doped poly(N-vinylcarbazole) composites
dc.typeArticle

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