Light-Emitting Element Structure With Intermediate-Layer Resonance
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Solution Overview
Problem
Existing light-emitting elements for display devices face challenges in achieving improved luminous efficiency and service life, which are crucial for applications in multimedia devices such as TVs and mobile phones.
Innovation Solution
A light-emitting element structure comprising a first and second electrode, a first and second light-emitting layer, and an intermediate layer with bipolar characteristics, where the intermediate layer has a thickness of about 90 nm to 170 nm, facilitating the transport of electrons and holes and optimizing optical distances for secondary and tertiary resonances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional light emitting element structure is used, then the device complexity is low, but the luminous efficiency and service life are insufficient
Solution Approach 1:
The light emitting element is divided into multiple functional layers including a first light emitting layer, a second light emitting layer, and an intermediate layer positioned between them. This segmentation allows each layer to perform specific functions (electron transport, hole transport, light emission) independently, improving overall device reliability and service life through specialized functional zones.
Solution Approach 2:
An intermediate layer is introduced between the first and second light emitting layers to facilitate charge transport and optimize optical resonance. This intermediary layer enables efficient electron and hole transport while maintaining optimal optical distances for secondary and tertiary resonances, thereby extending service life without excessive complexity.
2Use of energy by moving object
If the intermediate layer thickness is not optimized, then the manufacturing process is simple, but the luminous efficiency is reduced
Solution Approach 1:
The thickness of the intermediate layer is optimized to specific ranges (90-170 nm) to achieve optimal optical resonance conditions. By controlling this critical parameter, the device achieves enhanced luminous efficiency through secondary and tertiary optical resonances while maintaining feasible manufacturing precision requirements.
3Use of energy by moving object
If optical resonance conditions are not optimized, then the device structure is simple, but the luminous efficiency and service life are improved
Solution Approach 1:
The patent optimizes optical resonance by controlling the vertical dimension (thickness) of the intermediate layer and the optical distances from electrodes to light emitting layers. This dimensional optimization enables secondary and tertiary optical resonances that enhance luminous efficiency without requiring complex lateral structural modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration enhances the luminous efficiency and service life of the light-emitting elements by allowing concurrent secondary and tertiary resonant light emission, leading to improved performance in display panels.
Implementation Method 1
the intermediate layer may have bipolar characteristics to transport electrons and holes
Implementation Method 2
the light-emitting element may produce excitons by recombining holes and electrons injected from a first electrode and from a second electrode, and emits light by lowering the state of the produced excitons to the ground state
Implementation Method 3
a distance from the upper surface of the first electrode to the lower surface of the first light emitting layer may be a first optical distance at which the first light secondarily resonates optically, and a distance from the upper surface of the first electrode to the lower surface of the second light emitting layer may be a second optical distance at which the second light tertiarily resonates optically
Data Source
AI summary
A light emitting element includes: a first electrode, a second electrode facing the first electrode, a first light emitting layer between the first electrode and the second electrode to emit a first light, a second light emitting layer between the first light emitting layer and the second electrode to emit a second light, and an intermediate layer including a host material between the first light emitting layer and the second light emitting layer and, wherein the intermediate layer has a thickness of from about 90 nm to 170 nm.