Structured Antenna Layer for Blue OLED Triplet Decay
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Solution Overview
Problem
Blue phosphorescent OLEDs suffer from slow triplet exciton decay rates, leading to device degradation and shorter lifetimes due to larger bandgaps and higher energy requirements, which existing technologies have not adequately addressed.
Innovation Solution
A method of forming an antenna layer in OLEDs using particles on a support layer, where a material is deposited between the particles to create a structured antenna layer that confines surface plasmons and generates localized surface plasmon modes, enhancing interaction and resonance with surface plasmon polaritons to out-couple energy and improve device performance and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If blue phosphorescent OLEDs are used to achieve good colour saturation and low-power consumption, then device performance is improved, but triplet exciton decay rate remains slow leading to device degradation and short lifetime
Solution Approach 1:
The patent introduces a structured antenna layer comprising metallic nanoparticles as an intermediary component between the OLED and the environment. This antenna layer mediates the energy transfer process by coupling with surface plasmon polaritons (SPPs) and converting them into localized surface plasmon (LSP) modes, which then interact with triplet excitons to accelerate their decay rate and improve device lifetime
Solution Approach 2:
The patent changes the physical and optical parameters of the system by introducing a structured antenna layer with specific geometric configurations (particle size, spacing, arrangement). This alters the electromagnetic field distribution and plasmonic resonance characteristics, enabling enhanced coupling with triplet excitons and accelerated decay rates
2Illumination intensity
If higher energy is used to create excited states in blue emitters, then colour saturation is improved, but device degradation increases due to larger bandgap and higher energy requirements
Solution Approach 1:
The patent converts the harmful high-energy triplet excitons that cause device degradation into beneficial light emission. By introducing the structured antenna layer, the high-energy triplet excitons couple with LSP modes and are efficiently converted into photons through plasmonic enhancement, transforming the degradation mechanism into an enhanced emission mechanism
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 structured antenna layer increases the triplet decay rate, decreases triplet concentration, and enhances energy extraction, leading to improved performance and stability of the OLEDs, specifically in blue emitters.
Implementation Method 1
the antenna layer may be configured to confine one or more surface plasmons and/or to generate a localised surface plasmon (LSP) mode
Implementation Method 2
the LSP mode may be generated when the antenna layer is irradiated with photons emitted by the light emitting device
Implementation Method 3
depositing a material so that at least a portion of the material passes through the space between the at least two particles on to the support layer
Data Source
AI summary
The present disclosure relates to a method of forming an antenna layer for use in a light emitting device, the method comprising providing a plurality of particles on a support layer so that a space is formed between at least two particles of the plurality of particles, depositing a material so that at least a portion of the material passes through the space between the at least two particles on to the support layer and removing the plurality of particles from the support layer, the portion of the material remaining on the support layer to form at least a part of the antenna layer.