Organic Semiconductor Laser Diode Monolithic RGB Integration
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Solution Overview
Problem
Conventional inorganic semiconductor technologies face challenges in miniaturization and mass production of RGB laser diodes due to differing lattice parameters, limiting the use of versatile substrates and increasing manufacturing costs, and require different crystalline materials and processes for each device type, hindering monolithic integration.
Innovation Solution
The use of organic semiconductors allows for monolithic fabrication of multiple optoelectronic devices, such as organic solid-state lasers and light emitting diodes, on a variety of substrates like glass, plastics, and papers, using simple deposition techniques like inkjet printing and thermal evaporation, with integrated gratings for optical feedback.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional inorganic semiconductor materials are used to fabricate RGB laser diodes, then each device can achieve its specific light emission function, but different crystalline materials with different lattice parameters are required for red, green and blue lasers, making monolithic integration difficult
Solution Approach 1:
The patent changes the material parameter from crystalline inorganic semiconductors to amorphous organic semiconductors. This parameter change eliminates the lattice parameter mismatch problem that prevents monolithic integration of different colored laser diodes, as amorphous materials do not have rigid crystal structures with fixed lattice parameters.
Solution Approach 2:
The patent creates a universal substrate platform using amorphous organic semiconductor materials that can support multiple different optoelectronic devices (red, green, blue laser diodes, LEDs, photodetectors) with different functions on the same substrate, achieving multi-functionality and high integration density.
2Productivity
If different crystalline inorganic materials are grown on the same substrate to assemble different devices, then device functionality is achieved, but the manufacturing process becomes complex and costly
Solution Approach 1:
The patent changes the deposition method parameter from complex crystalline growth processes to simple amorphous film deposition techniques such as inkjet printing and thermal evaporation. This enables mass production with simplified manufacturing processes while maintaining device functionality.
Solution Approach 2:
The patent replaces complex mechanical and chemical crystalline growth systems with simpler deposition systems that can be easily scaled for mass production, such as inkjet printing systems and thermal evaporation apparatus, significantly improving ease of manufacture and productivity.
3Length of moving object
If conventional inorganic semiconductor laser diodes are miniaturized, then integration density improves, but the use of connectors and different driving conditions limits further miniaturization
Solution Approach 1:
The patent merges multiple separate inorganic semiconductor devices into a single monolithic integrated structure using amorphous organic semiconductor materials. Different optoelectronic devices are combined on one substrate without requiring external connectors, enabling further miniaturization and higher integration density.
Solution Approach 2:
The patent transitions from three-dimensional stacked integration with connectors to planar two-dimensional monolithic integration on a single substrate. This dimensional approach allows higher integration density while reducing overall device size and eliminating the need for vertical interconnectors.
4Adaptability or versatility
If adhesive bonding and chemical wet etching are used to integrate different inorganic materials, then some integration is achieved, but the process remains complex and material compatibility is limited
Solution Approach 1:
The patent changes the material state parameter from crystalline to amorphous, which fundamentally improves material compatibility. Amorphous organic semiconductor materials can be deposited on various substrates including glass, plastics, and papers using simple processes, eliminating the need for complex adhesive bonding and wet etching procedures required for crystalline materials.
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 approach increases integration density, supports miniaturization, and facilitates mass production of flexible and transparent devices, accelerating the development of all-organic electronic platforms with enhanced device functions.
Implementation Method 1
a current-injection organic semiconductor laser diode having a pair of electrodes, an optical resonator structure, and one or more organic layers including a light amplification layer composed of an organic semiconductor, which has a sufficient overlap between the distribution of exciton density and the electric field intensity distribution of the resonant optical mode during current injection to emit laser light
Implementation Method 2
an insulating grating, a first electrode, an organic layer and a second electrode in this order
Data Source
AI summary
Disclosed are an element comprising a substrate and at least two different optoelectronic devices, wherein the at least two different optoelectronic devices are monolithically fabricated on the substrate; and a method for producing the same. Also disclosed is an organic semiconductor laser diode comprising a substrate, an insulating grating, a first electrode, an organic layer and a second electrode in this order.