Thin Conversion Layers for Efficient Light Emission
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Summary
Problems
Conventional conversion layers with light-converting nanocrystals require well-controlled ambient conditions and a polymeric matrix, leading to limitations in formation and stability, especially in methods like microcontact printing and inkjet printing, which result in inefficient light conversion and potential cracking.
Innovation solutions
A thin conversion layer comprising light-converting nanocrystals encapsulated with a dielectric transparent oxide and crosslinked by ligands, eliminating the need for a matrix material and allowing for a dense, crack-free film formation without stringent environmental conditions, with optional nonabsorbing particles for improved light distribution and absorption.
TRIZ Analysis
Specific contradictions:
General conflict description:
Principle concept:
If conventional conversion layers use a polymeric matrix material, then the nanocrystals are stabilized, but the layer becomes thick and light absorption is reduced
Why choose this principle:
The patent removes the polymeric matrix material from the conversion layer, extracting only the essential nanocrystal particles and their ligand crosslinks. This eliminates the need for thick layers while maintaining nanocrystal stability through direct ligand-to-nanocrystal bonding.
Principle concept:
If conventional conversion layers use a polymeric matrix material, then the nanocrystals are stabilized, but the layer becomes thick and light absorption is reduced
Why choose this principle:
The invention creates a composite structure where nanocrystals are directly crosslinked via ligands without a polymeric matrix. This composite of nanocrystals and crosslinked ligands provides both stability and thin-film capability.
Application Domain
Data Source
AI summary:
A thin conversion layer comprising light-converting nanocrystals encapsulated with a dielectric transparent oxide and crosslinked by ligands, eliminating the need for a matrix material and allowing for a dense, crack-free film formation without stringent environmental conditions, with optional nonabsorbing particles for improved light distribution and absorption.
Abstract
A conversion layer, a light emitting device and a method for producing a conversion layer are disclosed. In an embodiment a conversion layer includes light-converting nanocrystals, an encapsulation surrounding the light-converting nanocrystals and ligands bonded to a surface of the encapsulation, wherein encapsulated light-converting nanocrystals are crosslinked by the ligands.