Light emission element

JP2025184983A5Pending Publication Date: 2026-07-06SEMICON ENERGY LAB CO LTD
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Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Applications
Current Assignee / Owner
Filing Date
2025-09-30
Publication Date
2026-07-06

AI Technical Summary

Technical Problem

Existing light-emitting elements using phosphorescent materials face challenges in achieving high luminous efficiency, particularly in developing stable compounds with high triplet excitation energy levels, especially for blue light emission, leading to difficulties in efficient light emission and increased driving voltage.

Method used

A light-emitting element is designed with a combination of a first and second organic compound forming an exciplex, where the HOMO and LUMO levels are strategically aligned to facilitate efficient energy transfer to a guest material, allowing for phosphorescent emission with reduced excitation energy, utilizing iridium complexes with specific ligands for enhanced triplet excitation energy conversion.

Benefits of technology

The solution provides a light-emitting element with high emission efficiency, reduced power consumption, and improved reliability, enabling efficient phosphorescent emission with lower driving voltage and stable operation.

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Abstract

To provide a light emission element having high light emission efficiency.SOLUTION: A light emission element includes a first organic compound, a second organic compound, and a guest material. The LUMO level of the first organic compound is lower than the LUMO level of the second organic compound, and the HOMO level of the first organic compound is lower than the HOMO level of the second organic compound. The HOMO level of the guest material is higher than the HOMO level of the second organic compound. An energy difference between the LUMO level of the guest material and the HOMO level of the guest material is larger than an energy difference between the LUMO level of the first organic compound and the HOMO level of the second organic compound. The guest material has a function for converting a triplet excitation energy to light emission. A combination of the first organic compound and the second organic compound forms an excited complex.SELECTED DRAWING: Figure 2
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