Thin Multi-Photon Emission Organic EL Device Structure
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Solution Overview
Problem
Conventional organic EL devices with Multi Photon Emission (MPE) structures face high manufacturing costs due to the need for thick organic layers, which are optimized in a single unit structure, making mass production costly and inefficient.
Innovation Solution
The development of an organic EL device with a thin MPE structure, featuring three or more light-emitting units layered with charge generation layers in between, and a total thickness of 360 nm or less between the electrode layers, optimizing the MPE structure for cost reduction and high power efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a conventional MPE structure with thick organic layers is used, then brightness and lifespan are improved, but manufacturing cost increases
Solution Approach 1:
The patent divides the thick organic layer into multiple thin light-emitting units (first, second, and third light-emitting units with different emission colors) stacked in sequence. Each unit has a thickness of 360 nm or less, allowing mass production while maintaining the brightness benefits of MPE structure through cumulative light emission from multiple units.
2Illumination intensity
If a conventional MPE structure with thick organic layers is used, then brightness is improved, but device complexity increases
Solution Approach 1:
The patent segments the MPE structure into multiple thin light-emitting units stacked vertically, each with simplified individual structure but collectively achieving the desired brightness. The charge generation layers are strategically positioned between units to facilitate charge injection without requiring complex interlayer structures.
Solution Approach 2:
The patent combines multiple light-emitting units with different emission colors (blue, green, red) into a single integrated device structure, achieving full-color emission and high brightness while maintaining a relatively simple overall architecture through the systematic arrangement of organic layers and charge generation layers.
3Productivity
If mass production is implemented for conventional MPE structures, then productivity increases, but manufacturing precision requirements worsen
Solution Approach 1:
The patent changes the critical parameter from thick organic layer (conventional MPE) to thin organic layer (360 nm or less), which is much easier to control with standard vacuum deposition equipment in mass production. This parameter change enables precise thickness control during manufacturing while maintaining MPE functionality through the stacked multi-unit configuration.
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
The thin MPE structure in organic EL devices achieves cost reduction and high power efficiency by optimizing the layering configuration, allowing for more efficient light emission while maintaining the brightness and lifespan benefits of the MPE structure.
Implementation Method 1
an organic EL layer including an organic light-emitting layer is interposed between a pair of mutually opposing electrodes. The organic EL layer emits light when a voltage is applied between the electrodes to allow an electric current to flow through the organic EL layer.
Data Source
AI summary
An organic EL device includes a light-transmitting substrate, a light-transmitting first electrode layer arranged on the substrate, three or more light-emitting units layered and arranged on the first electrode layer, each of the light-emitting units including a central organic emission layer, a hole transfer layer and an electron transfer layer, a plurality of charge generation layers, each of the charge generation layers being interposed and arranged between two corresponding adjacent ones of the light-emitting units, and a second electrode layer arranged on the light-emitting unit positioned highest in a layering direction among the light-emitting units. The total thickness of the layers interposed between the first electrode layer and the second electrode layer being 360 nm or less.