Fabrication of luminescent nanosheets using cellulose nanofibers toward development of functional electroluminescent device

2022 Fiscal Year Final Research Report

• Project/Area Number: 21K14215
• Research Category: Grant-in-Aid for Early-Career Scientists
• Allocation Type: Multi-year Fund
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Oita National College of Technology
• Principal Investigator: Tsuneyasu Shota 大分工業高等専門学校, 電気電子工学科, 助教 (40825395)
• Project Period (FY): 2021-04-01 – 2023-03-31
• Keywords: ペーパーエレクトロニクス / 面発光デバイス / 分散型EL / セルロースナノファイバー / 伝熱特性解析 / 機能性デバイス / ディスプレイ

Outline of Final Research Achievements

In this study, we developed a sticker-type surface-emitting device with a reusable light-emitting layer consisting of phosphor particles and cellulose fibers. To clarify the effects of surface roughness, the effect of surface roughness on electroluminescent (EL) properties was experimentally evaluated, and numerical simulations based on this experimental result revealed that the decrease in EL properties was caused by an increase in the effective film thickness. The intrinsic improvement of the luminance is the key to develop a versatile light-emitting devices. However, increasing applied voltage resulted in higher temperatures, resulting in low luminance. To solve this issue, the EL device on either an anisotropic in-plane heat conductive nanocomposite films or a kirigami-processed process which can improve a heat dissipation were introduced, achieving a low temperature driven EL device.

Free Research Field

電子デバイス、機能性デバイス

Academic Significance and Societal Importance of the Research Achievements

我々とあらゆる情報をシームレスにつなぐ超スマート社会の実現に向け、各種電子デバイスに関する研究開発が活発化している。従来の電子デバイスは、各部材の劣化度に関わらず全て廃棄する前提でデバイス設計されており、世界的に気運が高まる持続可能な社会の達成に向けた喫緊の課題である。これに対し本研究は、これまでに蓄積した知見をもとに「発光層の再利用」という革新的な機能性の付与に成功しており、広範な分野に波及効果が期待される。