Surface-Emitting Laser Quantum Well Structure for Thermal Reliability
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Solution Overview
Problem
Conventional surface emitting laser devices face issues with interfacial characteristics, light-emitting efficiency, and thermal resistance due to phase separation and inter-mixing between quantum well and quantum barrier materials, leading to decreased luminous efficiency and reliability.
Innovation Solution
Incorporating a ternary quantum well and binary intermediate layer with a superlattice structure between the quantum well and quantum barrier, and using a grading AlGaAs-based transition region in the reflective layer to minimize thermal resistance and carrier barriers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional quantum well and quantum barrier structure is used, then the device structure is simple, but phase separation and inter-mixing occur leading to decreased luminous efficiency and reliability
Solution Approach 1:
An intermediate layer is introduced between the quantum well and quantum barrier. This intermediate layer acts as a mediator that prevents direct inter-mixing between the quantum well and barrier materials, thereby improving interface quality and high-temperature reliability without requiring complete redesign of the active layer structure
Solution Approach 2:
The active layer is constructed as a composite structure combining ternary quantum well material, binary intermediate layer material, and quantum barrier material. This composite approach allows optimization of each layer's composition to prevent phase separation and inter-mixing, improving luminous efficiency and reliability
2Illumination intensity
If ternary quantum well and binary intermediate layer with superlattice structure are used, then peak intensity is enhanced and FWHM is reduced, but the device structure becomes more complex
Solution Approach 1:
The superlattice structure is applied locally within the intermediate layer rather than throughout the entire active layer. This localized approach enhances peak intensity and reduces FWHM by improving optical confinement and reducing interface states, while minimizing the overall structural complexity increase
Solution Approach 2:
The superlattice structure introduces a fine-scale dimensional variation within the intermediate layer thickness direction. This nanoscale modulation enhances optical properties by creating additional confinement effects and reducing interface roughness, achieving improved peak intensity and FWHM without lateral expansion
3Loss of energy
If conventional reflective layers are used, then thermal resistance increases, but the structure is simpler
Solution Approach 1:
An AlGaAs-based transition region is introduced as an intermediate layer between different reflective layer materials. This transition region serves as a thermal conduit that reduces thermal resistance by providing a graded composition profile that facilitates heat flow, while maintaining the overall reflective layer functionality
Solution Approach 2:
The AlGaAs-based transition region utilizes gradual composition parameter changes to optimize both thermal and optical properties. By varying the Al composition gradient, the structure achieves reduced thermal resistance through improved phonon transport while maintaining appropriate reflectivity characteristics
Data Source
AI summary
An embodiment relates to a surface emitting laser device and a light emitting device including the same. A surface emitting laser device according to the embodiment may include a first reflective layer; an active layer disposed on the first reflective layer; an aperture area disposed on the active layer and including an aperture and an insulating region; and a second reflective layer disposed in the aperture area. The active layer may comprise a plurality of quantum wells, quantum barriers, and intermediate layers disposed between the quantum wells and the quantum barriers. The quantum wells and the quantum barriers may include a ternary material, and the intermediate layers may comprise a binary material.