LIGHT EMITTING ELEMENT, DISPLAY DEVICE, AND PROJECTOR

To provide a light-emitting element that has a long life and suppresses a decrease in luminous efficiency.SOLUTION: A light-emitting element according to the present invention includes a light-emitting layer including a host material, and a first light-emitting dopant material and a second light-emi...

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Bibliographic Details
Main Authors YAMAMOTO HIDETOSHI, HAMADE YUIGA
Format Patent
LanguageEnglish
Japanese
Published 07.10.2022
Subjects
ADVERTISING
BASIC ELECTRIC ELEMENTS
CRYPTOGRAPHY
DISPLAY
DISPLAYING
EDUCATION
ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR
ELECTRICITY
LABELS OR NAME-PLATES
PHYSICS
SEALS
SEMICONDUCTOR DEVICES
SIGNS
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Summary:To provide a light-emitting element that has a long life and suppresses a decrease in luminous efficiency.SOLUTION: A light-emitting element according to the present invention includes a light-emitting layer including a host material, and a first light-emitting dopant material and a second light-emitting dopant material that are phosphorescent materials, and the energy difference between the lowest excited triplet level of the first light-emitting dopant material and the lowest excited triplet level of the second light-emitting dopant material is 0.05 eV or less.SELECTED DRAWING: Figure 6 【課題】長寿命化を図り、且つ発光効率の低下を抑えた発光素子を提供する。【解決手段】本発明の発光素子は、ホスト材料と、燐光材料である第１発光ドーパント材料及び第２発光ドーパント材料と、を含む発光層を備える。前記第１発光ドーパント材料の最低励起三重項準位と前記第２発光ドーパント材料の最低励起三重項準位とのエネルギー差は、０．０５ｅＶ以下である。【選択図】図６
Bibliography:Application Number: JP20210053432