OLED Device Spectral Conversion for White Light
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Solution Overview
Problem
Current organic light-emitting devices (OLEDs) face challenges in producing light with high efficiency and achieving specific color outputs, particularly in producing white light effectively.
Innovation Solution
The OLED device incorporates an organic active region with a converter material that converts a portion of the emitted radiation into a specific spectral range, combined with a filter material that transmits the desired wavelengths, allowing for the production of red, green, or blue light, enabling the creation of white light by mixing these colors. This setup can be adapted to produce other colors by adjusting the converter and filter materials.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an organic active region emits broad spectral range radiation, then the device can produce white light, but the efficiency of producing specific color light decreases
Solution Approach 1:
The patent segments the broad spectral radiation from the organic active region by introducing converter materials that divide the spectrum into specific wavelength ranges. Each converter material targets a particular color range (red, green, blue), converting a portion of the broad spectrum into focused spectral bands, thereby improving energy efficiency for specific color production while maintaining white light capability through the combination of all converters.
Solution Approach 2:
The patent introduces converter materials as intermediary components between the organic active region and the final light output. These converters act as mediators that transform the broad spectral radiation into specific color wavelengths, enabling efficient production of individual colors while the filter materials further refine the output to achieve desired color purity and white light balance.
2Measurement precision
If converter material is added to convert radiation to specific spectral range, then color accuracy improves, but device complexity increases
Solution Approach 1:
The patent merges the converter materials and filter materials into a unified optical conversion system that works together to achieve color accuracy. By combining multiple converters and filters in an integrated architecture, the system achieves precise color control without requiring separate, complex subsystems for each wavelength adjustment, thereby managing device complexity while maintaining high color accuracy.
Solution Approach 2:
The patent designs the converter and filter materials to perform multiple functions: converters both transform wavelengths and selectively transmit specific ranges, while filters simultaneously block unwanted wavelengths and transmit desired ones. This multi-functionality reduces the overall number of components needed, managing device complexity while achieving precise color accuracy through the coordinated action of these versatile materials.
3Measurement precision
If filter material is used to transmit specific spectral range, then color purity increases, but light intensity is reduced
Solution Approach 1:
The patent applies preliminary conversion actions before filtering by using converter materials to pre-transform the broad spectral radiation into specific wavelength ranges that match the filter transmission bands. This preliminary conversion ensures that when the filter material subsequently selects and transmits specific wavelengths, a higher proportion of the incident light falls within the transmission window, thereby maintaining higher light intensity while achieving the desired color purity.
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 the OLED device to produce light with high efficiency and tunable spectral ranges, allowing for the generation of white light and other colors, such as red, green, and blue, which can be combined to achieve full-color displays, enhancing the device's color accuracy and versatility.
Implementation Method 1
The converter material is excited by a spectral part of the incident radiation and re-emits radiation with other wavelengths
Implementation Method 2
The converter material comprises at least one of the following materials: inorganic phosphors
Implementation Method 3
The remaining radiation can be absorbed by the filter material, at least for the most part
Implementation Method 4
the organic active region is capable of producing white light which means that the organic active region emits, for example, radiation in a wavelength range between about 400 nm and 750 nm
Data Source
AI summary
An organic light-emitting device (OLED) comprising an organic active region which emits electromagnetic radiation, a conversion material which converts a portion of the radiation into light of a certain spectral range, and a filter material which transmits said light.