ZnMgO Electron-Transport Layer for Color-Efficient Light-Emitting Elements
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image display devices with uniform electron-transport layers across light-emitting pixels face inefficiencies in color emission due to varying conductor levels, leading to decreased brightness and external quantum efficiency.
Innovation Solution
A light-emitting element with a Zn1-XMgXO electron-transport layer, where the composition ratio X of Mg and thickness vary across regions corresponding to different wavelength-emitting sub-pixels, optimizing electron transport efficiency for red, green, and blue light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If uniform electron-transport layers are used across all light-emitting pixels, then manufacturing simplicity is maintained, but electron transport efficiency varies and brightness decreases
Solution Approach 1:
The electron-transport layer is designed with spatially varying composition ratios of Zn and Mg, where the Mg content differs in regions corresponding to different light-emitting layers. This local variation in material composition optimizes electron affinity and conductivity for each specific light-emitting layer, thereby improving electron transport efficiency and brightness for each color (red, green, blue) without requiring completely separate layer formation processes.
2Device complexity
If uniform electron-transport layers are used across all light-emitting pixels, then device complexity is reduced, but external quantum efficiency decreases
Solution Approach 1:
The composition ratio parameter (X in Zn1-XMgXO) of the electron-transport layer is varied across different regions to match the conductor levels of different light-emitting layers. By changing the Mg content parameter locally, the electron affinity and conductivity of the electron-transport layer are optimized for each light-emitting layer, thereby improving external quantum efficiency without adding significant structural complexity.
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 enables highly efficient color emission by matching electron affinity and conductivity to each light-emitting layer, enhancing brightness and quantum efficiency across sub-pixels.
Implementation Method 1
an electron-transport layer formed between the cathode and the light-emitting layer, and including a plurality of regions each corresponding to one of the light-emitting regions. The electron-transport layer includes a Zn1-XMgXO film
Data Source
AI summary
Provided is a light-emitting element to highly efficiently emit light in different colors. The light-emitting element includes: a cathode; an anode; a light-emitting layer formed between the cathode and the anode, and including a plurality of light-emitting regions respectively emitting light of different wavelengths; and an electron-transport layer formed between the cathode and the light-emitting layer, and including a plurality of regions each corresponding to one of the light-emitting regions. The electron-transport layer includes a Zn1-XMgXO film (where X is 0≤X<1). Of the plurality of regions included in the electron-transport layer, a region, corresponding to one of the light-emitting regions that emits light of a shorter wavelength, is higher in composition ratio X of Mg and/or less in thickness of the Zn1-XMgXO film.