Organic Light-Emitting Component for Alternating Current Operation
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Solution Overview
Problem
Conventional organic and inorganic light-emitting diodes require direct current for operation, making it difficult to utilize the advantages of alternating current, such as simple voltage transformation, and resulting in reduced service life due to the formation of long-lived space-charge regions and ion diffusion.
Innovation Solution
An organic light-emitting component with a unipolar charge carrier barrier layer and ambipolar injection layers, capable of operating efficiently with alternating current, featuring an alternating current control unit that converts mains voltage into alternating voltage, preventing excessive currents and voltages, and allowing independent control of amplitudes, amplitude ratio, and pulse-duty factor to optimize light emission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional organic light-emitting diodes are operated with direct current, then they can emit light, but it becomes impossible to exploit the advantages of alternating current and the service life is reduced due to space-charge regions and ion diffusion
Solution Approach 1:
The device is divided into multiple light-emitting layers (first light-emitting layer and second light-emitting layer) separated by a charge carrier barrier layer. This segmentation allows each layer to be independently controlled during alternating current operation, with one layer active during positive half-cycles and the other during negative half-cycles, enabling AC compatibility while maintaining reliability
Solution Approach 2:
The invention utilizes periodic alternating current operation where the first light-emitting layer emits light during positive half-cycles and the second light-emitting layer emits light during negative half-cycles. This periodic action eliminates the formation of long-lived space-charge regions and prevents ion diffusion, thereby extending service life while maintaining AC adaptability
2Ease of operation
If additional elements such as rectifier circuits are used to operate LEDs with mains voltage, then alternating current can be converted to direct current, but the device complexity increases and the advantages of alternating current are lost
Solution Approach 1:
The organic light-emitting component is designed with universal functionality to operate directly with alternating current without requiring rectifier circuits or additional conversion elements. The multi-layer structure with charge carrier barrier enables the device to function with both polarities of AC voltage, eliminating the need for complex DC conversion circuitry and preserving the simplicity of voltage transformation
Solution Approach 2:
The invention extracts and eliminates the rectifier circuit from the system by designing the light-emitting component itself to be inherently compatible with alternating current. This removes the need for additional external elements and simplifies the overall device structure while maintaining ease of operation with mains voltage
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 solution enables efficient operation with alternating current, increasing the service life of the organic light-emitting component by preventing space-charge regions and ion diffusion, while allowing for adjustable light spectrum and color control, reducing operating current or voltage, and eliminating flicker perception at high frequencies.
Implementation Method 1
a unipolar charge carrier barrier layer, which may in particular be based on organic material... a layer which does not allow one type of charge carrier to pass through or allows such passage only to a very limited extent
Implementation Method 2
at least one layer, which is configured to emit light or indeed to receive light when in operation... configured to emit electromagnetic radiation in the ultraviolet, visible and/or near-infrared spectral range
Data Source
AI summary
In at least one embodiment of the organic light-emitting component (10), the latter comprises a unipolar charge carrier balder layer (3), a first layer (1) and a second layer (2) which are applied to opposing sides of the charge carrier barrier layer (3) and are in each case formed of at least one organic material, and two ambipolar injection layers (4), which are applied to the sides of the first (1) and second layers (2) remote from the charge carrier barrier layer (3). Such an organic, light-emitting component (10) may be operated efficiently with alternating current.