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

8 Scopus citations

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
Volume29
Issue number31
DOIs
StatePublished - Aug 1 2019

Keywords

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

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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