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Cadmium-free quantum dots based violet light-emitting diodes: High-efficiency and brightness via optimization of organic hole transport layers.

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Title: Cadmium-free quantum dots based violet light-emitting diodes: High-efficiency and brightness via optimization of organic hole transport layers.
Authors: Lin, Qingli1,2, Shen, Huaibin2 shenhuaibin@henu.edu.cn, Wang, Hongzhe2, Wang, Aqiang2, Niu, Jinzhong2, Qian, Lei2, Guo, Fang1 fguo@lnu.edu.cn, Li, Lin Song2 lsli@henu.edu.cn
Source: Organic Electronics. Oct2015, Vol. 25, p178-183. 6p.
Subjects: Cadmium compounds, Quantum dots, Zinc sulfide, Fabrication (Manufacturing), Carbazole
Abstract: Bright and efficient violet quantum dot (QD) based light-emitting diodes (QD-LEDs) with heavy-metal-free ZnSe/ZnS have been demonstrated by choosing different hole transport layers, including poly(4-butyl-phenyl-diphenyl-amine) (poly-TPD), poly[9,9-dioctylfluorene-co-N-[4-(3-methylpropyl)]-diphenylamine] (TFB), and poly-N-vinylcarbazole (PVK). Violet QD-LEDs with maximum luminance of about 930 cd/m 2 , the maximum current efficiency of 0.18 cd/A, and the peak EQE of 1.02% when poly-TPD was used as HTL. Higher brightness and low turn-on voltage (3.8 V) violet QD-LEDs could be fabricated when TFB was used as hole transport material. Although the maximum luminance could reach up to 2691 cd/m 2 , the devices exhibited only low current efficiency (∼0.51 cd/A) and EQE (∼2.88%). If PVK is used as hole transport material, highly efficient violet QD-LEDs can be fabricated with lower maximum luminance and higher turn-on voltages compared with counterpart using TFB. Therefore, TFB and PVK mixture in a certain proportion has been used as HTL, turn-on voltage, brightness, and efficiency all have been improved greatly. The QD-LEDs is fabricated with 7.39% of EQE and 2856 cd/m 2 of maximum brightness with narrow FWHM less than 21 nm. These results represent significant improvements in the performance of heavy-metal-free violet QD-LEDs in terms of efficiency, brightness, and color purity. [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.)
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DbLabel: Engineering Source
An: 108615152
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  Data: Cadmium-free quantum dots based violet light-emitting diodes: High-efficiency and brightness via optimization of organic hole transport layers.
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  Data: <searchLink fieldCode="AR" term="%22Lin%2C+Qingli%22">Lin, Qingli</searchLink><relatesTo>1,2</relatesTo><br /><searchLink fieldCode="AR" term="%22Shen%2C+Huaibin%22">Shen, Huaibin</searchLink><relatesTo>2</relatesTo><i> shenhuaibin@henu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Wang%2C+Hongzhe%22">Wang, Hongzhe</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Wang%2C+Aqiang%22">Wang, Aqiang</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Niu%2C+Jinzhong%22">Niu, Jinzhong</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Qian%2C+Lei%22">Qian, Lei</searchLink><relatesTo>2</relatesTo><br /><searchLink fieldCode="AR" term="%22Guo%2C+Fang%22">Guo, Fang</searchLink><relatesTo>1</relatesTo><i> fguo@lnu.edu.cn</i><br /><searchLink fieldCode="AR" term="%22Li%2C+Lin+Song%22">Li, Lin Song</searchLink><relatesTo>2</relatesTo><i> lsli@henu.edu.cn</i>
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  Data: <searchLink fieldCode="JN" term="%22Organic+Electronics%22">Organic Electronics</searchLink>. Oct2015, Vol. 25, p178-183. 6p.
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  Data: <searchLink fieldCode="DE" term="%22Cadmium+compounds%22">Cadmium compounds</searchLink><br /><searchLink fieldCode="DE" term="%22Quantum+dots%22">Quantum dots</searchLink><br /><searchLink fieldCode="DE" term="%22Zinc+sulfide%22">Zinc sulfide</searchLink><br /><searchLink fieldCode="DE" term="%22Fabrication+%28Manufacturing%29%22">Fabrication (Manufacturing)</searchLink><br /><searchLink fieldCode="DE" term="%22Carbazole%22">Carbazole</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: Bright and efficient violet quantum dot (QD) based light-emitting diodes (QD-LEDs) with heavy-metal-free ZnSe/ZnS have been demonstrated by choosing different hole transport layers, including poly(4-butyl-phenyl-diphenyl-amine) (poly-TPD), poly[9,9-dioctylfluorene-co-N-[4-(3-methylpropyl)]-diphenylamine] (TFB), and poly-N-vinylcarbazole (PVK). Violet QD-LEDs with maximum luminance of about 930 cd/m 2 , the maximum current efficiency of 0.18 cd/A, and the peak EQE of 1.02% when poly-TPD was used as HTL. Higher brightness and low turn-on voltage (3.8 V) violet QD-LEDs could be fabricated when TFB was used as hole transport material. Although the maximum luminance could reach up to 2691 cd/m 2 , the devices exhibited only low current efficiency (∼0.51 cd/A) and EQE (∼2.88%). If PVK is used as hole transport material, highly efficient violet QD-LEDs can be fabricated with lower maximum luminance and higher turn-on voltages compared with counterpart using TFB. Therefore, TFB and PVK mixture in a certain proportion has been used as HTL, turn-on voltage, brightness, and efficiency all have been improved greatly. The QD-LEDs is fabricated with 7.39% of EQE and 2856 cd/m 2 of maximum brightness with narrow FWHM less than 21 nm. These results represent significant improvements in the performance of heavy-metal-free violet QD-LEDs in terms of efficiency, brightness, and color purity. [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.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1016/j.orgel.2015.06.032
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      – Code: eng
        Text: English
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        PageCount: 6
        StartPage: 178
    Subjects:
      – SubjectFull: Cadmium compounds
        Type: general
      – SubjectFull: Quantum dots
        Type: general
      – SubjectFull: Zinc sulfide
        Type: general
      – SubjectFull: Fabrication (Manufacturing)
        Type: general
      – SubjectFull: Carbazole
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      – TitleFull: Cadmium-free quantum dots based violet light-emitting diodes: High-efficiency and brightness via optimization of organic hole transport layers.
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            NameFull: Lin, Qingli
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            NameFull: Shen, Huaibin
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            NameFull: Wang, Hongzhe
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            NameFull: Wang, Aqiang
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            – D: 01
              M: 10
              Text: Oct2015
              Type: published
              Y: 2015
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              Value: 25
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            – TitleFull: Organic Electronics
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