OLED Lighting Apparatus with Horizontal Orientation and Short Reduction Pattern
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Solution Overview
Problem
Current lighting apparatuses using incandescent and fluorescent lamps face inefficiencies in energy use and color rendering, while LED lamps have reduced luminous efficiency due to light loss at the interface of organic layers and cathodes in OLEDs.
Innovation Solution
A lighting apparatus using an OLED with a phosphorescent light emitting layer having a high degree of horizontal orientation adjacent to the cathode and a short reduction pattern in the anode to minimize surface plasmon polariton loss, and a three-stack tandem structure with green and red phosphorescent layers and a blue fluorescent layer to enhance emission efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light emitting diodes are combined to emit white light, then the color rendering index is improved, but the luminous efficiency is lowered
Solution Approach 1:
The patent segments the white light emission into multiple distinct light emitting layers, each responsible for a specific color wavelength range. The first light emitting layer emits blue light (450-480nm), the second emits green light (500-560nm), and the third emits red light (600-680nm). This segmentation allows each layer to operate at its peak luminous efficiency while collectively producing high-quality white light with excellent color rendering index.
2Illumination intensity
If organic light emitting diode is used, then the color rendering index is improved, but light is trapped at the interface of organic layers and cathode resulting in lowered luminous efficiency
Solution Approach 1:
The patent applies local quality by giving each light emitting layer distinct optical and electrical characteristics optimized for its specific function. The first light emitting layer uses a transparent hole injection layer with specific refractive index, while the second and third layers use reflective electrodes. Each layer's structure and materials are locally optimized to maximize light extraction efficiency for that specific wavelength range, thereby reducing overall energy loss.
3Illumination intensity
If multiple phosphorescent light emitting layers are used, then the emission spectrum is optimized, but the device complexity increases
Solution Approach 1:
The patent merges multiple light emitting layers with different color emissions (blue, green, red) into a single integrated OLED device structure. All three light emitting layers are formed on the same substrate and share common electrode structures and encapsulation layers. This merging approach achieves a complete emission spectrum covering the visible range while avoiding the complexity of three separate devices, as the layers work协同 to produce white light.
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
Improves luminous efficiency by minimizing light loss and optimizing the emission spectrum, resulting in a lighting apparatus with enhanced energy efficiency and color rendering similar to sunlight.
Implementation Method 1
A phosphorescent light emitting layer having a highest degree of horizontal orientation of a dopant among the plurality of phosphorescent light emitting layers is disposed to be adjacent to the cathode... to minimize a surface plasmon polariton loss
Implementation Method 2
an organic layer disposed on the anode and including a plurality of phosphorescent light emitting layers
Data Source
AI summary
An organic light emitting diode comprises an anode; an organic layer disposed on the anode and including a plurality of phosphorescent light emitting layers; and a cathode disposed on the organic layer, wherein a phosphorescent light emitting layer having a highest degree of horizontal orientation of a dopant among the plurality of phosphorescent light emitting layers is disposed to be adjacent to the cathode, and wherein the anode includes a short reduction pattern which implements a narrow path.