Efficient Blue Phosphorescent OLEDs with Improved Stability and Color Purity through Judicious Triplet Exciton Management

Kody Klimes, Zhi Qiang Zhu, Jian Li

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Highly efficient and stable blue phosphorescent organic light-emitting diodes are achieved by employing a step-wise graded doping of platinum(II) 9-(pyridin-2-yl)-2-(9-(pyridin-2-yl)-9H-carbazol-2-yloxy)-9H-carbazole (PtNON) in a device setting. A device employing PtNON demonstrates a high peak external quantum efficiency (EQE) of 17.4% with an estimated LT70 lifetime of over 1330 h at a brightness of 1000 cd m−2. PtNON is then investigated as a “triplet sensitizer” in an alternating donor–acceptor doped emissive layer to further improve the device emission color purity by carefully managing an efficient Förster resonant energy transfer from PtNON to 2,5,8,11-tetra-tert-butylperylene as a selected acceptor material. Thus, such OLED devices demonstrate an EQE of 16.9% with color coordinates of (0.16, 0.25) and an estimated luminance (LT70) lifetime of 628 h at a high brightness of 1000 cd m−2.

Original languageEnglish (US)
Article number1903068
JournalAdvanced Functional Materials
DOIs
StatePublished - Jan 1 2019

Fingerprint

Organic light emitting diodes (OLED)
Excitons
Luminance
purity
excitons
Color
Quantum efficiency
color
quantum efficiency
brightness
acceptor materials
Platinum
life (durability)
Energy transfer
carbazoles
luminance
Doping (additives)
platinum
light emitting diodes
energy transfer

Keywords

  • blue OLEDs
  • external quantum efficiency
  • operational stability
  • Pt(II) complex
  • triplet exciton

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Biomaterials
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Electrochemistry

Cite this

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title = "Efficient Blue Phosphorescent OLEDs with Improved Stability and Color Purity through Judicious Triplet Exciton Management",
abstract = "Highly efficient and stable blue phosphorescent organic light-emitting diodes are achieved by employing a step-wise graded doping of platinum(II) 9-(pyridin-2-yl)-2-(9-(pyridin-2-yl)-9H-carbazol-2-yloxy)-9H-carbazole (PtNON) in a device setting. A device employing PtNON demonstrates a high peak external quantum efficiency (EQE) of 17.4{\%} with an estimated LT70 lifetime of over 1330 h at a brightness of 1000 cd m−2. PtNON is then investigated as a “triplet sensitizer” in an alternating donor–acceptor doped emissive layer to further improve the device emission color purity by carefully managing an efficient F{\"o}rster resonant energy transfer from PtNON to 2,5,8,11-tetra-tert-butylperylene as a selected acceptor material. Thus, such OLED devices demonstrate an EQE of 16.9{\%} with color coordinates of (0.16, 0.25) and an estimated luminance (LT70) lifetime of 628 h at a high brightness of 1000 cd m−2.",
keywords = "blue OLEDs, external quantum efficiency, operational stability, Pt(II) complex, triplet exciton",
author = "Kody Klimes and Zhu, {Zhi Qiang} and Jian Li",
year = "2019",
month = "1",
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doi = "10.1002/adfm.201903068",
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journal = "Advanced Functional Materials",
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AU - Klimes, Kody

AU - Zhu, Zhi Qiang

AU - Li, Jian

PY - 2019/1/1

Y1 - 2019/1/1

N2 - Highly efficient and stable blue phosphorescent organic light-emitting diodes are achieved by employing a step-wise graded doping of platinum(II) 9-(pyridin-2-yl)-2-(9-(pyridin-2-yl)-9H-carbazol-2-yloxy)-9H-carbazole (PtNON) in a device setting. A device employing PtNON demonstrates a high peak external quantum efficiency (EQE) of 17.4% with an estimated LT70 lifetime of over 1330 h at a brightness of 1000 cd m−2. PtNON is then investigated as a “triplet sensitizer” in an alternating donor–acceptor doped emissive layer to further improve the device emission color purity by carefully managing an efficient Förster resonant energy transfer from PtNON to 2,5,8,11-tetra-tert-butylperylene as a selected acceptor material. Thus, such OLED devices demonstrate an EQE of 16.9% with color coordinates of (0.16, 0.25) and an estimated luminance (LT70) lifetime of 628 h at a high brightness of 1000 cd m−2.

AB - Highly efficient and stable blue phosphorescent organic light-emitting diodes are achieved by employing a step-wise graded doping of platinum(II) 9-(pyridin-2-yl)-2-(9-(pyridin-2-yl)-9H-carbazol-2-yloxy)-9H-carbazole (PtNON) in a device setting. A device employing PtNON demonstrates a high peak external quantum efficiency (EQE) of 17.4% with an estimated LT70 lifetime of over 1330 h at a brightness of 1000 cd m−2. PtNON is then investigated as a “triplet sensitizer” in an alternating donor–acceptor doped emissive layer to further improve the device emission color purity by carefully managing an efficient Förster resonant energy transfer from PtNON to 2,5,8,11-tetra-tert-butylperylene as a selected acceptor material. Thus, such OLED devices demonstrate an EQE of 16.9% with color coordinates of (0.16, 0.25) and an estimated luminance (LT70) lifetime of 628 h at a high brightness of 1000 cd m−2.

KW - blue OLEDs

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KW - Pt(II) complex

KW - triplet exciton

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