View in EDS

High-performance azure blue quantum dot light-emitting diodes via doping PVK in emitting layer.

Saved in:
Bibliographic Details
Title: High-performance azure blue quantum dot light-emitting diodes via doping PVK in emitting layer.
Authors: Wang, Lei1, Chen, Tao1, Lin, Qingli1, Shen, Huaibin1 shenhuaibin@henu.edu.cn, Wang, Aqiang1, Wang, Hongzhe1, Li, Chunyang2 lichunyang@zknu.edu.cn, Li, Lin Song1 lsli@henu.edu.cn
Source: Organic Electronics. Oct2016, Vol. 37, p280-286. 7p.
Subjects: Quantum dots, Light emitting diodes, Doping agents (Chemistry), Charge injection, Carbazole, Quantum chemistry, Quantum efficiency
Abstract: Highly bright and efficient azure blue quantum dot-based light-emitting diodes (QD-LEDs) have been demonstrated by employing ZnCdSe core/multishell QDs as emitters and the crucial development we report here is the ability to dramatically enhance the efficiency and brightness through doping poly vinyl( N -carbazole) (PVK) in the emissive layer to balance the charge injection. The best device displays remarkable features like maximum luminance of 13,800 cd/m 2 , luminous efficiency of 6.41 cd/A, and external quantum efficiency (EQE) of 8.76%, without detectable red-shift and broadening in electroluminescence (EL) spectra with increasing voltage as well as good spectral matching between photoluminescence (PL) and EL. Such azure blue quantum-dot LEDs show a 140% increase in external quantum efficiency compared with QD-LEDs without PVK. More important, the peak efficiency of the QD-LEDs with PVK dopant is achieved at luminance of about 1000 cd/m 2 , and high efficiency (EQE > 8%) can be maintained with brightness ranging from 200 to 2400 cd/m 2 . There are two main aspects of the role of PVK in the proposed system. Firstly, the lower HOMO of PVK than (poly[9,9-dioctylfluorene- co - N -[4-(3-methylpropyl)]-diphenylamine] (TFB) can reduce the potential barrier for 0.4 eV at the interface of QDs and hole transport layer which could result in higher hole injection efficiency along with good EQE as compared to TFB-only HTLs. Secondly, with PVK acting as buffer layer of TFB and QDs, the exciton energy transfer from the organic host to the QDs can be effectively improved. [ABSTRACT FROM AUTHOR]
Copyright of Organic Electronics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
FullText Text:
  Availability: 0
Header DbId: egs
DbLabel: Engineering Source
An: 117441866
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
PreciseRelevancyScore: 0
IllustrationInfo
Items – Name: Title
  Label: Title
  Group: Ti
  Data: High-performance azure blue quantum dot light-emitting diodes via doping PVK in emitting layer.
– Name: Author
  Label: Authors
  Group: Au
  Data: <searchLink fieldCode="AR" term="%22Wang%2C+Lei%22">Wang, Lei</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Chen%2C+Tao%22">Chen, Tao</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Lin%2C+Qingli%22">Lin, Qingli</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Shen%2C+Huaibin%22">Shen, Huaibin</searchLink><relatesTo>1</relatesTo><i> shenhuaibin@henu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Aqiang%22">Wang, Aqiang</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Hongzhe%22">Wang, Hongzhe</searchLink><relatesTo>1</relatesTo><br /><searchLink fieldCode="AR" term="%22Li%2C+Chunyang%22">Li, Chunyang</searchLink><relatesTo>2</relatesTo><i> lichunyang@zknu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Lin+Song%22">Li, Lin Song</searchLink><relatesTo>1</relatesTo><i> lsli@henu.edu.cn</i>
– Name: TitleSource
  Label: Source
  Group: Src
  Data: <searchLink fieldCode="JN" term="%22Organic+Electronics%22">Organic Electronics</searchLink>. Oct2016, Vol. 37, p280-286. 7p.
– Name: Subject
  Label: Subjects
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Quantum+dots%22">Quantum dots</searchLink><br /><searchLink fieldCode="DE" term="%22Light+emitting+diodes%22">Light emitting diodes</searchLink><br /><searchLink fieldCode="DE" term="%22Doping+agents+%28Chemistry%29%22">Doping agents (Chemistry)</searchLink><br /><searchLink fieldCode="DE" term="%22Charge+injection%22">Charge injection</searchLink><br /><searchLink fieldCode="DE" term="%22Carbazole%22">Carbazole</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+chemistry%22">Quantum chemistry</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+efficiency%22">Quantum efficiency</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Highly bright and efficient azure blue quantum dot-based light-emitting diodes (QD-LEDs) have been demonstrated by employing ZnCdSe core/multishell QDs as emitters and the crucial development we report here is the ability to dramatically enhance the efficiency and brightness through doping poly vinyl( N -carbazole) (PVK) in the emissive layer to balance the charge injection. The best device displays remarkable features like maximum luminance of 13,800 cd/m 2 , luminous efficiency of 6.41 cd/A, and external quantum efficiency (EQE) of 8.76%, without detectable red-shift and broadening in electroluminescence (EL) spectra with increasing voltage as well as good spectral matching between photoluminescence (PL) and EL. Such azure blue quantum-dot LEDs show a 140% increase in external quantum efficiency compared with QD-LEDs without PVK. More important, the peak efficiency of the QD-LEDs with PVK dopant is achieved at luminance of about 1000 cd/m 2 , and high efficiency (EQE > 8%) can be maintained with brightness ranging from 200 to 2400 cd/m 2 . There are two main aspects of the role of PVK in the proposed system. Firstly, the lower HOMO of PVK than (poly[9,9-dioctylfluorene- co - N -[4-(3-methylpropyl)]-diphenylamine] (TFB) can reduce the potential barrier for 0.4 eV at the interface of QDs and hole transport layer which could result in higher hole injection efficiency along with good EQE as compared to TFB-only HTLs. Secondly, with PVK acting as buffer layer of TFB and QDs, the exciton energy transfer from the organic host to the QDs can be effectively improved. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Organic Electronics is the property of Elsevier B.V. and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=egs&AN=117441866
RecordInfo BibRecord:
  BibEntity:
    Identifiers:
      – Type: doi
        Value: 10.1016/j.orgel.2016.06.032
    Languages:
      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 7
        StartPage: 280
    Subjects:
      – SubjectFull: Quantum dots
        Type: general
      – SubjectFull: Light emitting diodes
        Type: general
      – SubjectFull: Doping agents (Chemistry)
        Type: general
      – SubjectFull: Charge injection
        Type: general
      – SubjectFull: Carbazole
        Type: general
      – SubjectFull: Quantum chemistry
        Type: general
      – SubjectFull: Quantum efficiency
        Type: general
    Titles:
      – TitleFull: High-performance azure blue quantum dot light-emitting diodes via doping PVK in emitting layer.
        Type: main
  BibRelationships:
    HasContributorRelationships:
      – PersonEntity:
          Name:
            NameFull: Wang, Lei
      – PersonEntity:
          Name:
            NameFull: Chen, Tao
      – PersonEntity:
          Name:
            NameFull: Lin, Qingli
      – PersonEntity:
          Name:
            NameFull: Shen, Huaibin
      – PersonEntity:
          Name:
            NameFull: Wang, Aqiang
      – PersonEntity:
          Name:
            NameFull: Wang, Hongzhe
      – PersonEntity:
          Name:
            NameFull: Li, Chunyang
      – PersonEntity:
          Name:
            NameFull: Li, Lin Song
    IsPartOfRelationships:
      – BibEntity:
          Dates:
            – D: 01
              M: 10
              Text: Oct2016
              Type: published
              Y: 2016
          Identifiers:
            – Type: issn-print
              Value: 15661199
          Numbering:
            – Type: volume
              Value: 37
          Titles:
            – TitleFull: Organic Electronics
              Type: main
ResultId 1