Semiconductor Nanocrystal Light-Emitting Device for Brightness and Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional light-emitting devices face challenges in achieving high brightness, long device lifetime, and efficient operation, particularly in terms of brightness, color range, efficiency, and operating voltage, due to limitations in the electronic structure of materials used.
Innovation Solution
A display is developed using a substrate with a semiconducting material and a circuit, incorporating a light-emitting device with semiconductor nanocrystals as the light-emitting material, which includes a charge transport layer and an electrode material in electrical connection, allowing for controlled light emission and improved optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional light-emitting materials are used, then device structure is simple, but brightness and color range are limited
Solution Approach 1:
The patent changes the fundamental parameter of the light-emitting material from conventional organic compounds to semiconductor nanocrystals, which have different electronic structures and optical properties. This material parameter change enables superior brightness and color tunability without significantly complicating the overall device structure
Solution Approach 2:
The invention uses composite material structures including semiconductor nanocrystals embedded in a matrix material, combined with charge transport layers and electrode materials. This composite approach optimizes both optical performance and electrical characteristics while maintaining device manufacturability
2Use of energy by moving object
If conventional light-emitting materials are used, then device structure is simple, but efficiency and operating voltage are poor
Solution Approach 1:
The patent changes the material parameter from conventional organic light-emitting materials to semiconductor nanocrystals, which offer superior charge carrier mobility and radiative recombination efficiency. This enables higher operating efficiency and lower operating voltages while the device structure remains relatively simple with standard layers
Solution Approach 2:
The invention introduces charge transport layers as intermediary components between the electrodes and the light-emitting nanocrystal layer. These intermediary layers facilitate efficient charge injection and extraction, improving overall device efficiency without requiring complex structural modifications
3Duration of action of stationary object
If conventional light-emitting materials are used, then manufacturing is simple, but device lifetime is short
Solution Approach 1:
The patent changes the material parameter to semiconductor nanocrystals, which possess superior chemical stability and resistance to degradation compared to organic materials. This extends device lifetime significantly while the manufacturing process remains straightforward using solution-based deposition techniques
Solution Approach 2:
The invention employs solution-processable nanocrystal materials that can be deposited using simple, low-cost techniques such as spin-coating or dip-coating. This maintains ease of manufacture while the resulting device achieves extended operational lifetime due to the stability of the inorganic nanocrystal material
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 use of semiconductor nanocrystals in light-emitting devices enhances brightness, color tunability, and efficiency, while reducing operating voltage and increasing device lifetime, enabling the creation of high-performance displays with improved light emission characteristics.
Implementation Method 1
Light-emitting devices can release photons in response to excitation of an active component of the device. Emission can be stimulated by applying a voltage across the active component (e.g., an electroluminescent component) of the device. The emitted light has an emission profile that includes a maximum emission wavelength, and an emission intensity
Implementation Method 2
The electronic structure (e.g., energy gaps) of the material can alter the emission profile, and other physical characteristics of the device. For example, the brightness, range of color, efficiency, operating voltage, and operating half-lives of light-emitting devices can vary based on the structure of the device
Data Source
AI summary
A display comprises a substrate and a light-emitting device disposed on the substrate, wherein the substrate comprises a semiconducting material and a circuit for controlling the light-emitted from the light-emitting device. A light-emitting device includes a light-emitting material comprising semiconductor nanocrystals and an electrode in electrical connection with the light-emitting material on a side thereof remote from the substrate.