Tamm Plasmon Stack Purcell Enhancement in OLEDs
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Solution Overview
Problem
Conventional organic light emitting diodes (OLEDs) face challenges in achieving optimal stability and external quantum efficiency, particularly due to non-radiative mechanisms and limited spectral response of Tamm plasmon modes, which affect their performance and longevity.
Innovation Solution
Incorporating a Tamm plasmon stack with a distributed Bragg reflector (DBR) and optimizing the number of DBR layers to enhance the Purcell effect, while aligning the electric field peak with the emissive layer to maximize energy transfer and stability, and using a combination of materials and structures that allow for efficient energy coupling into Tamm plasmon modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a Tamm plasmon stack is incorporated into OLED structure, then external quantum efficiency is improved, but device stability deteriorates due to non-radiative mechanisms
Solution Approach 1:
The patent modifies the optical parameters of the OLED structure by incorporating a Tamm plasmon stack with specific DBR layer configurations. This changes the photonic environment to enhance external quantum efficiency through Purcell effect while managing stability through parameter optimization
Solution Approach 2:
The patent uses a composite structure combining organic emissive layers with inorganic Tamm plasmon stack components (DBR layers, metal layers). This composite approach enables simultaneous achievement of enhanced efficiency through plasmonic effects and managed stability through material selection and layer design
2Use of energy by moving object
If the number of DBR layers is increased to enhance Purcell effect, then energy transfer is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by using a limited number of DBR layers (not the maximum possible) to achieve sufficient Purcell enhancement. This partial approach balances energy transfer improvement with acceptable device complexity, avoiding excessive layer stacking
Solution Approach 2:
The patent ensures continuous useful action by optimizing the DBR layer configuration to maintain sustained energy transfer efficiency. The layered structure provides continuous optical path for energy transfer from emissive layer through the Tamm plasmon mode
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 approach improves the stability and external quantum efficiency of OLEDs by extending their luminance-adjusted lifetime and maintaining acceptable brightness, balancing device stability and efficiency through structural fine-tuning and energy alignment.
Implementation Method 1
Incorporating a Tamm plasmon stack with a distributed Bragg reflector (DBR) and optimizing the number of DBR layers to enhance the Purcell effect
Implementation Method 2
efficient energy coupling into Tamm plasmon modes
Implementation Method 3
Incorporating a Tamm plasmon stack with a distributed Bragg reflector (DBR)
Implementation Method 4
aligning the electric field peak with the emissive layer to maximize energy transfer and stability
Implementation Method 5
OLEDs make use of thin organic films that emit light when voltage is applied across the device
Data Source
AI summary
Device structures are provided that include an OLED arranged in a stack with one or more additional layers that form a Tamm plasmon stack. The structure allows for coupling emitter excited state energy into the emissive Tamm plasmon mode.