Organic light-emitting device and display apparatus

By using a cover layer composed of high-refractive and low-refractive index materials in organic light emitting diodes (OLED) devices, the impact of ultraviolet light on device life in the prior art is solved, achieving a longer life and efficient luminous effect.

WO2024198752A9 Publication Date: 2025-03-27BOE TECHNOLOGY GROUP CO LTD
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Patent Information

Application Number
PCT/CN2024/076859
Authority / Receiving Office
WO · WO
Patent Type
Applications
Current Assignee / Owner
Priority Date
2023-03-27
Filing Date
2024-02-08
Publication Date
2025-03-27

AI Technical Summary

Technical Problem

The existing organic light emitting diode (OLED) devices have little lifespan, mainly because the high refractive index material has a narrow absorption range in the ultraviolet region, which causes damage to the guest material in the light-emitting layer after the ultraviolet light penetrates.

Method used

Using a cover layer composed of high-refractive index materials and low-refractive index materials, the maximum absorption peak position of the high-refractive index materials is located in the 360nm-400nm band, and the maximum absorption peak position of the low-refractive index materials is located in the 300nm-320nm band. By combining the two Laminated arrangements are provided in the cover layer to enhance the absorption of ultraviolet light.

Benefits of technology

It effectively reduces ultraviolet light entering the device, avoids the decomposition of the guest material in the luminescent layer, and significantly improves the device's life and luminous efficiency.

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Abstract

An organic light-emitting device and a display apparatus, which belong to the technical field of display. The organic light-emitting device comprises a first electrode layer (100), a light-emitting functional layer (300), a second electrode layer (200) and a covering layer (400), which are stacked in sequence, wherein the covering layer (400) comprises a first covering layer material and a second covering layer material; at the same wavelength, the refractive index of the first covering layer material is greater than that of the second covering layer material; and the maximum absorption peak of the first covering layer material is located between a 360 nm waveband and a 400 nm waveband.
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