Organic electroluminescence device with improved optical outcoupling efficiency

By using a low-refractive-index pixel confinement layer and a high-refractive-index contrast design in the OLED structure, the problem of low optical output coupling efficiency in the OLED structure is solved by utilizing the total internal reflection mechanism, thereby improving external quantum efficiency and simplifying the manufacturing process.

CN116438941BActive Publication Date: 2026-06-16APPLIED MATERIALS INC +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
APPLIED MATERIALS INC
Filing Date
2020-09-21
Publication Date
2026-06-16

AI Technical Summary

Technical Problem

The existing OLED structure suffers from low optical output coupling efficiency, which causes a large amount of light to be trapped inside the display, affecting display clarity and contrast. Furthermore, conventional improvement methods may lead to reduced display resolution or manufacturing difficulties.

Method used

By employing a low-refractive-index pixel-limiting layer (PDL) with high refractive index contrast between the organic light-emitting unit and the filler layer, and utilizing a total internal reflection mechanism to increase light extraction efficiency, the use of mirrors and photonic crystals is avoided, making it suitable for top- and bottom-emitting OLED structures.

Benefits of technology

It improves the external quantum efficiency of OLEDs, reduces light leakage and energy loss, simplifies the manufacturing process, and is applicable to various OLED structures.

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Abstract

Embodiments of the present disclosure generally relate to electroluminescent devices (e.g., organic light emitting diodes) and displays including electroluminescent devices. In one embodiment, an electroluminescent device is provided, including: a pixel defining layer; an organic light emitting unit disposed on at least a portion of the pixel defining layer; and a filling layer disposed on at least a portion of the organic light emitting unit, wherein a refractive index of the pixel defining layer is less than a refractive index of the filling layer, and wherein the refractive index of the pixel defining layer is less than a refractive index of one or more layers of the organic light emitting unit. In another embodiment, a display device is provided, including: a substrate; a thin film transistor formed on the substrate; an interconnect electrically coupled to the thin film transistor; and an electroluminescent device electrically coupled to the interconnect.
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