Quantum Dot Mixed Layer Structure for Lower Leakage Emission
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Solution Overview
Problem
Existing elements containing quantum dot phosphor particles face performance limitations due to issues such as leakage current and reduced efficiency, particularly in light-emitting elements.
Innovation Solution
The proposed element includes a first electrode, a second electrode, a quantum dot phosphor layer, a first carrier transport layer formed as a continuous film, and a second carrier transport layer with nanoparticles, optionally with a mixed layer containing quantum dot phosphor particles and nanoparticles. This configuration enhances carrier transport and reduces leakage currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a layer containing inorganic nanoparticles is used as an electron injection/transport layer or hole injection/transport layer, then carrier transport is enhanced, but leakage current increases and efficiency decreases
Solution Approach 1:
The patent divides the carrier transport function into two separate layers: a first carrier transport layer with a continuous film structure and a second carrier transport layer with nanoparticles. This segmentation allows each layer to perform its function optimally - the continuous film provides stable carrier transport with low leakage, while the nanoparticle layer enhances carrier injection and transport efficiency without causing excessive leakage current.
Solution Approach 2:
The patent employs composite material structures in both carrier transport layers, combining organic and inorganic materials. The first carrier transport layer uses a continuous film of organic material, while the second layer combines nanoparticles with organic matrix material. This composite approach enables optimized electrical properties, mechanical stability, and reduced leakage current simultaneously.
2Power
If quantum dot phosphor particles are used in the light-emitting layer, then light emission efficiency is improved, but device stability and carrier transport become problematic
Solution Approach 1:
The patent introduces carrier transport layers as intermediary structures between the electrodes and the quantum dot phosphor layer. These layers act as mediators that facilitate efficient carrier transport to the quantum dots while protecting the device structure from degradation. The continuous film structure provides stable interfaces that enhance device reliability without compromising the high light emission efficiency of the quantum dot phosphor particles.
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 improves the performance of the element by reducing leakage currents and enhancing efficiency, thereby achieving better performance compared to related art elements.
Implementation Method 1
a light-emitting element that is an example of these elements includes (i) a layer containing QD phosphor particles (a light-emitting layer)
Implementation Method 2
a first carrier transport layer located between the first electrode and the quantum dot phosphor layer and formed of a continuous film of a first carrier transport material; and a second carrier transport layer located between the first carrier transport layer and the quantum dot phosphor layer and including nanoparticles formed of a second carrier transport material
Data Source
AI summary
In an element provided with a QD layer including QD phosphor particles, a first hole transport layer located between a first electrode and the QD layer is formed of a continuous film of a first carrier transport material. A second hole transport layer located between the first hole transport layer and the QD layer includes nanoparticles formed of a second carrier transport material.