Balancing the white emission of OLED by a design of fluorescent blue and phosphorescent green/red emitting layer structures

Young Hoon Lee, Byeong Kwon Ju, Woo Sik Jeon, Jang Hyuk Kwon, O. Ok Park, Jae Woong Yu, Byung Doo Chin

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

In this paper, we performed the design on the relative thickness of fluorescent-phosphorescent light emitters and evaluated the corresponding change of spectral characteristics of white organic light emitting diode (WOLED). Use of a 3-nm-thick separator composed of undoped phosphorescent host, which provides the confinement of singlet exciton, yields relatively well-defined broadband white emission. The optimized multilayers in WOLED comprises one of the simplest device structures among the reported fluorescent-phosphorescent hybrid WOLEDs, representing the Commission Internationale de l'Eclairage (CIE) 1931 chromaticity ranging from the nearly pure (0.30, 0.35) to warm white (0.35, 0.40) of 9.0-12.5 cd/A (24,000 cd/m2 at 12 V bias). Although the presented efficiency data is not as high as the reports of others, design principles for a bright and stabilized three-peak-balanced white emission are discussed in detail, which will be beneficial for a step forwards in the development of broadband WOLED.

Original languageEnglish
Pages (from-to)325-330
Number of pages6
JournalSynthetic Metals
Volume159
Issue number3-4
DOIs
Publication statusPublished - 2009 Feb 1

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Keywords

  • Broadband emission
  • Design methods
  • Fluorescent and phosphorescent
  • White OLED

ASJC Scopus subject areas

  • Mechanical Engineering
  • Mechanics of Materials
  • Materials Chemistry
  • Metals and Alloys
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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