Image-Forming OLED Source Spectral Matching to Photosensitive Absorption
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Solution Overview
Problem
Existing image-forming apparatuses with organic light-emitting elements suffer from light absorption by the organic layer, reducing the efficiency of light transfer to the photosensitive member.
Innovation Solution
The image-forming apparatus is configured such that the maximum emission peak wavelength of the organic light-emitting element is closer to the wavelength of maximum absorption of the photosensitive member than the organic compound layers, enhancing light absorption by the photosensitive member.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If an optical resonator structure is used in the organic light-emitting element to increase emission intensity at a specific wavelength, then the emission intensity is improved, but light is absorbed by the organic layer multiple times during reflection between electrodes, reducing overall light transfer efficiency
Solution Approach 1:
The patent changes the wavelength parameter of the emitted light to be outside the absorption range of the organic compound layers. By selecting an emission wavelength that does not overlap with the absorption spectrum of the organic layers, the light can pass through the organic light-emitting element without being absorbed, thus resolving the contradiction between achieving high emission intensity and minimizing energy loss.
2Device complexity
If the organic light-emitting element uses a bottom emission configuration with transparent substrate to expose light to the photosensitive member, then the structure is simplified, but light absorption by the organic layer reduces the efficiency of image formation
Solution Approach 1:
The patent changes the wavelength parameter of the emitted light to match the absorption characteristics of the photosensitive member while avoiding absorption by the organic layers. This allows the bottom emission configuration to maintain its structural simplicity while achieving high image formation efficiency, as the light passes through the organic layers without absorption and is effectively absorbed by the photosensitive member.
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 configuration increases the efficiency of image formation by ensuring more light is absorbed by the photosensitive member, thereby improving overall image quality and efficiency.
Implementation Method 1
an organic light-emitting element includes a first electrode, a first organic compound layer, a light-emitting layer, a second organic compound layer, and a second electrode
Implementation Method 2
a maximum emission peak wavelength in an emission spectrum of the organic light-emitting element is closer to a wavelength of a maximum absorption value in a visible light region of an optical absorption spectrum of the photosensitive member
Data Source
AI summary
An image-forming apparatus including a light source including an organic light-emitting element on a first surface of a substrate; and a photosensitive member configured to receive light from the organic light-emitting element. The organic light-emitting element includes a first electrode, a first organic compound layer, a light-emitting layer, a second organic compound layer, and a second electrode in this order from the first surface. A maximum emission peak wavelength in an emission spectrum of the organic light-emitting element is closer to a wavelength of a maximum absorption value in a visible light region of an optical absorption spectrum of the photosensitive member than a longest peak wavelength in an optical absorption spectrum of the first organic compound layer or a longest peak wavelength in an optical absorption spectrum of the second organic compound layer.