Photoelectric Modification Layer for Balanced Carrier Recombination
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Solution Overview
Problem
Conventional photoelectric devices, such as OLEDs and QLEDs, suffer from low luminous efficiency due to imbalanced electron and hole migration rates, leading to material degradation and performance deterioration.
Innovation Solution
Incorporating a modification layer composed of a first organic semiconductor material and a first inorganic nanoparticle between the electrode and the optical functional layer to facilitate carrier recombination and exciton formation, enhancing luminous efficiency by preventing material damage and promoting carrier transport.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional OLED or QLED structure is used, then device structure is simple and manufacturing is easy, but luminous efficiency is low
Solution Approach 1:
The patent divides the electron transport layer into two distinct functional layers: a first electron transport layer (closest to anode) and a second electron transport layer (closest to cathode). This segmentation allows each layer to be optimized for specific functions - the first layer facilitates hole extraction and the second layer optimizes electron transport, thereby improving carrier balance and luminous efficiency while maintaining manufacturing feasibility through sequential deposition processes
Solution Approach 2:
The patent applies local quality by assigning different material compositions and functional characteristics to different regions of the electron transport system. The first electron transport layer uses materials optimized for hole extraction near the anode, while the second electron transport layer uses materials optimized for electron transport near the cathode. This spatial differentiation of material properties optimizes carrier transport at each location, addressing the imbalanced carrier migration problem and improving overall luminous efficiency
2Device complexity
If conventional photoelectric device structure is used, then device complexity is low, but material degradation occurs leading to reduced device lifetime
Solution Approach 1:
The patent segments the electron transport function across two separate layers with distinct material compositions and functional roles. This segmentation prevents excessive electron accumulation and energy concentration at any single interface, thereby reducing stress on individual materials and extending device lifetime. The first electron transport layer protects the anode interface while the second electron transport layer optimizes the cathode interface, distributing functional demands to enhance overall device reliability
Solution Approach 2:
The patent introduces intermediate electron transport layers between the electrodes and the light-emitting layer. These intermediary layers act as buffer zones that facilitate controlled carrier transport and prevent direct, high-energy carrier impact on the light-emitting layer and electrode interfaces. This intermediary structure reduces material degradation at critical interfaces, thereby extending device operational life without significantly increasing overall device complexity
Data Source
AI summary
Disclosed are a photoelectric device, and a preparation method thereof. The photoelectric device includes a first electrode, a modification layer, an optical functional layer and a second electrode disposed sequentially in stack. A material of the modification layer includes a first organic semiconductor material and a first inorganic nanoparticle. The photoelectric device has a high luminous efficiency.