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説明:

Organic light-emitting diodes aim to achieve high efficiency by using excitons to achieve a 100% quantum efficiency (QE). However, developing functional organic materials for this purpose can be time-consuming. To address this challenge, a new method has been proposed to incorporate inorganic quantum dots into the organic luminescent layer to enable unlimited exciton formation and approach the 100% QE limit. Inorganic quantum dots are clusters of atoms that contain numerous thermally generated electrons and holes at conduction and valence bands. Immersed quantum
dots act as charge generation centers, providing electrons and holes with unlimited amounts to form excitons. After radiative recombination, these excitons generate photons that cause internal QE to nearly 100%. This concept has been demonstrated using Silicon quantum dots (SiQDs) and phosphorescent materials. The average size of SiQDs is approximately 6 nm, and they are well-dispersed within the guest–host blue phosphorescent light-emitting materials. With only 5× ­10–3% (in weight) of SiQDs in the precursor, external QE increased from 2 to 17.7%, nearly a nine-fold enhancement. The prolonged decay time from 1.68 to 5.97 ns indicates that electrons are transferred from SiQDs to the luminescent materials. This universal method can be applied to green and red emissions with various inorganic quantum dots in different organic luminescent material systems.

権利情報:

• Creative Commons BY Attribution 4.0 International
  

キーワード: Quantum Dots, Quantum Efficiency, Phosphorescent, Light-Emitting Diode

刊行年月日: 2024-12-14

出版者: Springer Science and Business Media LLC

掲載誌:

• Discover Nano (ISSN: 27319229) vol. 19 issue. 1 202

研究助成金:

• Ministry of Education “Innovation and Development Center of Sustainable Agriculture” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project
• National Science and Technology Council NSTC-112-2221-E-005-066-, NSTC-111-2622-E-005-008
• National Science and Technology Council NSTC-112-2221-E-005-066-, NSTC-111-2622-E-005-008
• National Science and Technology Council NSTC-112-2221-E-005-066-, NSTC-111-2622-E-005-008
• MEXT, Japan World Premier International Research Center Initiative WPII
• MEXT, Japan World Premier International Research Center Initiative WPII

原稿種別: 著者最終稿 (Accepted manuscript)

MDR DOI:

公開URL: https://doi.org/10.1186/s11671-024-04171-w

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更新時刻: 2025-11-12 16:30:12 +0900

MDRでの公開時刻: 2025-11-12 16:24:02 +0900