OLED Emitter Layer with Phosphorescent and Fluorescent Materials
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Solution Overview
Problem
Conventional organic light-emitting diode (OLED) signage applications are cost-intensive and technically demanding due to complex structuring processes required for representing information.
Innovation Solution
A light-emitting component with an emitter layer comprising a first and a second emitter material, where the first display region emits light exclusively at low current intensity and the second display region emits additional light at higher current intensity, allowing for mixed light emission and reversible color contrast for information representation without complex structuring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If conventional structuring methods (laser, condensed resist gas, partial modification) are used to represent information in OLEDs, then information representation is achieved, but production cost and technical complexity increase significantly
Solution Approach 1:
The patent applies parameter changes by utilizing different current intensity levels to activate different emitter materials. At low current intensity, only the first emitter material is excited, while at high current intensity, both the first and second emitter materials are excited, producing different colors. This electrical parameter control eliminates the need for complex physical structuring methods like laser processing or condensed resist gas, thereby reducing both production cost and technical complexity while maintaining information representation capability.
Solution Approach 2:
The patent employs composite materials by combining multiple emitter materials with different excitation thresholds within the same OLED structure. The first emitter material has a lower excitation threshold than the second emitter material, allowing selective activation based on current intensity. This composite approach enables information representation through color contrast without requiring complex device structuring, thus resolving the contradiction between information representation and device complexity.
2Adaptability or versatility
If multiple emitter materials with different excitation thresholds are used, then electrically switchable color contrast for information representation is achieved, but device structure complexity increases
Solution Approach 1:
The patent utilizes parameter changes by designing emitter materials with distinct excitation thresholds that can be controlled through current intensity. The first emitter material excites at lower current densities, while the second requires higher current densities. This parameter-based control mechanism enables versatile, electrically switchable information representation without complicating the device structure, as the same physical structure serves multiple functional states through electrical parameter modulation.
3Loss of information
If conventional OLED signage methods are used, then information display is achieved, but production cost increases
Solution Approach 1:
The patent reduces production cost by eliminating expensive post-manufacturing structuring processes. Instead of using laser processing or condensed resist gas methods, the invention achieves information display through parameter changes in current intensity that selectively activate different emitter materials. This approach simplifies the manufacturing process to standard OLED fabrication techniques, significantly reducing production costs while maintaining full information display capability.
Solution Approach 2:
The patent employs composite emitter materials that can be deposited using standard OLED manufacturing techniques. The first and second emitter materials are incorporated into the emitter layer during conventional vacuum deposition or solution processing, eliminating the need for expensive subsequent structuring steps. This composite material approach enables cost-effective production of OLED signage while preserving information display functionality through electrically controlled color contrast.
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
Enables simple and electrically switchable representation of information in OLEDs, reducing production costs and technical complexity while maintaining high brightness and color contrast.
Implementation Method 1
a first electromagnetic radiation is emitted upon the transition from the first excited state to the ground state of the first emitter material
Implementation Method 2
a second electromagnetic radiation is emitted upon the transition from the excited state of the second emitter material to the ground state of the second emitter material
Implementation Method 3
The excited state of the second emitter material is occupied substantially by means of an energy transfer from the second excited state of the first emitter material to the excited state of the second emitter material
Data Source
AI summary
A light-emitting component provides an emitter layer including phosphorescent and fluorescent emitter materials, and at least one predefined first and second display regions. The first region has both emitter materials. The second region has the phosphorescent emitter material. A first electromagnetic radiation is emitted upon the transition from the first excited state to the ground state of the phosphorescent emitter material. A second electromagnetic radiation is emitted upon the transition from the excited state to the ground state of the fluorescent emitter material. The excited state of the fluorescent emitter material is occupied by an energy transfer from the second excited state of the phosphorescent emitter material to the excited state of the fluorescent emitter material so that a mixed light composed of first and second electromagnetic radiations is emittable from the first region, and the light that is emittable from the second region is free of second electromagnetic radiation.