Smart Window Electrode Design for Light Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Dual emission type organic light-emitting devices with transparent electrodes suffer from low light efficiency and contrast ratio compared to bottom or top emission types, especially when one side light emission is required.
Innovation Solution
Replacing the transparent electrode of an organic light-emitting device with a high-reflection electrode and forming a predetermined light transmission portion to enhance light efficiency and contrast ratio without compromising transmittance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a transparent electrode is used in a dual emission type organic light-emitting device, then light transmission is achieved, but light efficiency and contrast ratio are greatly lowered
Solution Approach 1:
The device is divided into two distinct emission regions: a first emission region with a transparent electrode for light transmission, and a second emission region with a reflective electrode for light reflection. This segmentation allows each region to be optimized for its specific function, resolving the contradiction between light transmission and light efficiency
Solution Approach 2:
Different electrode configurations are applied to different regions of the device. The first region uses a transparent electrode structure optimized for light transmission, while the second region uses a reflective electrode structure optimized for light efficiency and contrast ratio. This local differentiation allows simultaneous achievement of both light transmission and high light efficiency in respective regions
2Illumination intensity
If a transparent electrode is used in a dual emission type organic light-emitting device, then light transmission is achieved, but contrast ratio is lowered
Solution Approach 1:
The device is divided into two distinct emission regions: a first emission region with a transparent electrode for light transmission, and a second emission region with a reflective electrode for light reflection. This segmentation allows each region to be optimized for its specific function, resolving the contradiction between light transmission and light efficiency
Solution Approach 2:
Different electrode configurations are applied to different regions of the device. The first region uses a transparent electrode structure optimized for light transmission, while the second region uses a reflective electrode structure optimized for light efficiency and contrast ratio. This local differentiation allows simultaneous achievement of both light transmission and high light efficiency in respective regions
3Illumination intensity
If a high-reflection electrode replaces the transparent electrode, then light efficiency and contrast ratio are improved, but light transmission is compromised
Solution Approach 1:
The device is divided into two distinct emission regions: a first emission region with a transparent electrode for light transmission, and a second emission region with a reflective electrode for light reflection. This segmentation allows each region to be optimized for its specific function, resolving the contradiction between light transmission and light efficiency
Solution Approach 2:
The organic light-emitting device structure is designed to support multiple emission modes (front emission and back emission) through different electrode configurations in different regions, allowing the same device to serve multiple functions and achieve both light transmission and high light efficiency
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 significantly improves light efficiency and contrast ratio of organic light-emitting devices while maintaining transmittance, making them suitable for smart windows that can function as one side or double side emission type illuminators or displays.
Implementation Method 1
an electrochromic device including an electrochromic layer containing an electrochromic material and disposed over the organic light-emitting device
Implementation Method 2
the first electrode is formed of a transparent electrode or a high-reflection translucent electrode, and the second electrode is formed of a high-reflection electrode
Implementation Method 3
When a voltage is applied between the anode and the cathode, holes are injected from the anode into the light-emitting layer, and electrons are injected from the cathode into the light-emitting layer. The holes and electrons injected into the light-emitting layer are recombined with each other to generate excitons, and such excitons are shifted from an excited state to a ground state to emit light
Data Source
AI summary
A smart window is provided. The smart window includes an organic light-emitting device including first and second electrodes corresponding to each other, and a light-emitting layer disposed between the first and second electrodes and containing an organic light-emitting material; an electrochromic device including an electrochromic layer containing an electrochromic material and disposed over the organic light-emitting device, wherein the organic light-emitting device is disposed under the electrochromic device to form a light transmission portion in a predetermined region, and wherein the first electrode is formed of a transparent electrode or a high-reflection translucent electrode, and the second electrode is formed of a high-reflection electrode.