Light Emitting Element Nanoparticle Electron Transport
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Solution Overview
Problem
Existing organic electroluminescence light emitting elements face challenges in achieving high emission efficiency and long element lifetime due to limitations in electron transport properties and stability.
Innovation Solution
A light emitting element is designed with an electron transport region that includes nanoparticles with a core compound represented by Formula 1 and a ligand represented by Formula 2 or Formula 3, which enhances electron transport and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional electron transport materials are used, then the device structure is simple, but the emission efficiency and element lifetime are insufficient
Solution Approach 1:
The electron transport region uses composite nanoparticle materials consisting of a core compound (Formula 1) and a shell compound (Formula 2 or 3). This composite structure combines the electron transport capability of the core with the stability and defect-passivation properties of the shell, achieving both high emission efficiency and long element lifetime while maintaining a relatively simple device structure.
Solution Approach 2:
The invention changes the chemical composition parameters of the electron transport materials by introducing specific core compounds (AxOy where A is Zn or Sn) and shell compounds with defined chemical formulas. This parameter optimization enhances electron mobility and reduces non-radiative recombination, directly improving emission efficiency and element lifetime without significantly complicating the device structure.
2Productivity
If conventional electron transport materials are used, then the material composition is simple, but the electron transport properties are insufficient
Solution Approach 1:
The electron transport region employs composite nanoparticles with a core-shell structure where the core (AxOy) provides efficient electron transport pathways and the shell (Formula 2 or 3) enhances stability and reduces defect states. This composite approach achieves superior electron transport properties while the nanoparticles can be integrated into the existing device architecture without major structural modifications.
3Power
If conventional materials are used in the electron transport region, then the device structure is simple, but the emission efficiency is insufficient
Solution Approach 1:
The core-shell nanoparticle structure in the electron transport region creates optimal conditions for electron injection and transport. The core compound (AxOy) facilitates electron mobility while the shell compound (Formula 2 or 3) passivates surface defects and reduces non-radiative recombination centers. This composite material approach significantly enhances emission efficiency while maintaining a relatively simple overall device structure.
Solution Approach 2:
The invention applies local quality optimization by designing the electron transport region with specific nanoparticle compositions (core and shell compounds) that are tailored for this particular function. The core-shell structure provides localized defect passivation at the nanoparticle surfaces where electron injection occurs, directly improving emission efficiency without requiring changes to the entire device structure.
Data Source
AI summary
A light emitting element of an embodiment includes a first electrode, a hole transport region on the first electrode, an emission layer on the hole transport region, an electron transport region on the emission layer, and a second electrode on the electron transport region, the electron transport region includes a nanoparticle including a nanoparticle core and a ligand, the nanoparticle core includes a core compound represented by Formula 1, and the ligand is bonded to the surface of the nanoparticle core and represented by Formula 2 or Formula 3.