Quantum Dot Light Emitting Element With Photosensitive Host Material
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Solution Overview
Problem
Existing light-emitting elements with quantum dot phosphor particles suffer from low luminous efficiency and shortened service life due to poor carrier transport properties in the host material, leading to an imbalance between electrons and holes.
Innovation Solution
Incorporating a light-emitting layer with quantum dot phosphor particles, a positive hole transport layer, and an electron transport layer, along with a photosensitive host material, to enhance the transport of carriers and balance between electrons and holes, using specific substances like carbazole derivatives and oxadiazole derivatives for improved mobility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a photosensitive host material with poor carrier transport properties is used in the light-emitting layer, then the device structure can be simplified, but the transport properties of electrons or holes supplied from the electrode deteriorate, leading to low luminous efficiency and shortened service life
Solution Approach 1:
The light-emitting layer is segmented into multiple functional components: photosensitive host material for pattern formation, quantum dot phosphor particles for light emission, positive hole transport substance for hole transport, and electron transport substance for electron transport. This segmentation allows each component to specialize in its function, resolving the contradiction between structural simplicity and transport performance.
Solution Approach 2:
The light-emitting layer uses a composite material system combining photosensitive host material with quantum dot phosphor particles, positive hole transport substance, and electron transport substance. This composite approach enables simultaneous achievement of patternability, light emission, and balanced carrier transport, improving luminous efficiency and service life without excessive structural complexity.
2Ease of manufacture
If a photosensitive host material with poor carrier transport properties is used, then manufacturing can be easier, but the balance between the amount of positive holes and the amount of electrons supplied to the quantum dot phosphor particles deteriorates
Solution Approach 1:
The invention changes the functional parameters of the light-emitting layer by introducing separate positive hole transport substance and electron transport substance. This parameter change enables independent optimization of hole and electron transport, achieving balanced carrier supply to quantum dot phosphor particles while maintaining ease of manufacture through the photosensitive host material's patternability.
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 results in a light-emitting element with high luminous efficiency and extended service life by effectively transporting and balancing positive holes and electrons, thereby improving the overall performance.
Implementation Method 1
The light-emitting layer formation step includes an application step of applying, on a base material, a liquid including a photosensitive host material... an exposure step of exposing the photosensitive host material, and a development step of developing the photosensitive host material
Implementation Method 2
quantum dot phosphor particles configured to emit light in association with a bonding of the positive holes and the electrons
Data Source
AI summary
Alight-emitting element includes an anode electrode, a cathode electrode, a light-emitting layer, a positive hole transport layer, and an electron transport layer. The light-emitting layer, the positive hole transport layer, and the electron transport layer are provided between the anode electrode and the cathode electrode. The light-emitting layer includes QD phosphor particles, a positive hole transport substance configured to transport positive holes transported thereto by the positive hole transport layer, an electron transport substance configured to transport electrons transported thereto by the electron transport layer, and a photosensitive host material.