Ultimate molecular orientation for enhancement of light-outcoupling efficiency in organic light-emitting diodes

2017 Fiscal Year Final Research Report

• Project/Area Number: 16K17972
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Device related chemistry
• Research Institution: Kyushu University
• Principal Investigator: Komino Takeshi 九州大学, 分子システムデバイス国際リーダー教育センター, 助教 (20547301)
• Research Collaborator: Kotani Masahiro 学習院大学, 名誉教授
• Project Period (FY): 2016-04-01 – 2018-03-31
• Keywords: 分子配向 / 有機EL / 光取り出し効率 / ゲスト-ホスト薄膜 / 熱活性化型遅延蛍光 / 真空蒸着膜 / トランスファーマトリックス / スピンコート薄膜

Outline of Final Research Achievements

Completely horizontally oriented fluorescent guest molecules doped into organic thin films were successfully attained by vacuum vapor deposition. Applying the ultimate orientation to organic light-emitting diodes, light-outcoupling efficiency of 39% was achieved; the value was over 50% higher than those of randomly oriented films. Through the project, it was demonstrated that use of long linear-shaped guest molecules is of great importance for realizing horizontal orientation of the guest molecules.
In addition to the guest orientation control in vapor deposited films, the orientation formation process was investigated even in spin-coated films. The investigation found that the solution flow during deposition is the dominant factor to control orientation.

Free Research Field

分子集合体物性