Quantum Dot Light-Emitting Element with Buffer-Layer Charge Injection
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Solution Overview
Problem
The luminous efficiency of light-emitting elements containing a continuous film of an inorganic compound and quantum dots is low.
Innovation Solution
Incorporating a charge function layer, a light-emitting layer with a continuous film of an inorganic compound and first quantum dots, and a buffer layer with second quantum dots in contact with the charge function layer, while minimizing semiconductor junctions to enhance charge injection and radiative recombination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a continuous film of inorganic compound and quantum dots is used in the light-emitting layer, then the light-emitting element can be manufactured with simplified structure, but the luminous efficiency becomes low
Solution Approach 1:
The light-emitting element is divided into distinct functional layers: a light-emitting layer containing a continuous film and first quantum dots, and a buffer layer containing second quantum dots. This segmentation allows each layer to perform its specific function optimally while maintaining overall structural simplicity.
Solution Approach 2:
The buffer layer acts as an intermediary between the charge function layer and the light-emitting layer. It facilitates efficient charge injection and transport to the first quantum dots, reducing charge injection loss and improving luminous efficiency without complicating the overall device structure.
2Ease of operation
If multiple semiconductor junctions are present in the light-emitting element, then charge injection can be facilitated, but luminous efficiency decreases due to increased charge injection loss
Solution Approach 1:
The patent extracts and eliminates unnecessary semiconductor junctions by using a buffer layer with second quantum dots that are in contact with the charge function layer, thereby reducing charge injection loss while maintaining effective charge injection to the light-emitting layer.
Solution Approach 2:
The patent changes the material composition and structural parameters of the buffer layer and quantum dots to optimize charge injection characteristics. By carefully selecting the composition of the buffer layer and quantum dots, efficient charge injection is achieved with minimal loss.
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 solution significantly improves luminous efficiency by reducing charge injection loss and enhancing radiative recombination, achieving higher external quantum efficiency (EQE) and lower voltage operation.
Implementation Method 1
enhancing radiative recombination
Implementation Method 2
a light-emitting layer including a continuous film of an inorganic compound and a plurality of first quantum dots included in the continuous film
Data Source
AI summary
A light-emitting element includes: a charge function layer; a light-emitting layer including a continuous film of an inorganic compound and a plurality of first quantum dots included in the continuous film; and a buffer layer including a plurality of second quantum dots in contact with the charge function layer and the continuous film.