Research Abstract


Promising operational stability of high-efficiency organic light-emitting diodes based on thermally activated delayed fluorescence

2013年7月3日 Scientific Reports 3 : 2127 doi: 10.1038/srep02127


中野谷 一1, 2, 益居 健介1, 3, 西出 順一1, 柴田 巧1, 4 & 安達 千波矢1, 2, 5

  1. 九州大学 最先端有機光エレクトロニクス 研究センター
  2. 九州先端科学技術研究所 有機光デバイス研究室
  3. 富士フイルム先進研究所
  4. 株式会社ジャパンディスプレイ 研究開発本部
  5. 九州大学 カーボンニュートラル・エネルギー国際研究所
Organic light-emitting diodes (OLEDs) are attractive for next-generation displays and lighting applications because of their potential for high electroluminescence (EL) efficiency, flexibility and low-cost manufacture. Although phosphorescent emitters containing rare metals such as iridium or platinum produce devices with high EL efficiency, these metals are expensive and their blue emission remains unreliable for practical applications. Recently, a new route to high EL efficiency using materials that emit through thermally activated delayed fluorescence (TADF) was demonstrated. However, it is unclear whether devices that emit through TADF, which originates from the contributions of triplet excitons, are reliable. Here we demonstrate highly efficient, stable OLEDs that emit via TADF by controlling the position of the carrier recombination zone, resulting in projected lifetimes comparable to those of tris(2-phenylpyridinato)iridium(III)-based reference OLEDs. Our results indicate that TADF is intrinsically stable under electrical excitation and optimization of the surrounding materials will enhance device reliability.