EAGER: A New Approach to Realize (ZnSe)x(GaAs)1-x Alloys for Light Emission and Other Photonics Applications

EAGER：一种实现用于发光和其他光子学应用的 (ZnSe)x(GaAs)1-x 合金的新方法

• 批准号: 1648705
• 负责人: Jerry Woodall
• 金额: $ 10万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2016
• 资助国家: 美国
• 起止时间: 2016-07-15 至 2017-06-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1648705&HistoricalAwards=false
• 关键词: EAGER; New; Approach; Realize; ZnSe

Title: EAGER: A Single Materials System that Could Finally Realize Light Emitting Devices with Optimal ChromaticityAbstractNontechnical Description:In spite of the tremendous progress made in the last 55 years in developing visible Light Emitting Diodes (LEDs) for applications that require red, green, and blue emitters, at least two different materials systems are still required to realize systems having only the approximate hue and colorfulness properties (chromaticity) that is required. This is a major problem because having to use two different materials technologies adds a large cost to the production of displays that have red, green, and blue elements (pixels), such as scoreboards at public arenas. Furthermore, the current technology does not produce optimal chromaticity in the display systems. Neither of these systems can efficiently produce the required "true" green color. Thus, the combination of high cost and non-optimal chromaticity has prevented the use of pixelated displays for color images for TV systems; modern TV systems use inexpensive white emitting LEDs as the light source to visualize the liquid crystal pixelated TV image. Therefore, it is the goal of this research to perform both fundamental materials science and construct exploratory devices that will realize a unified technology to reduce the manufacturing production costs and improve chromaticity for visible display applications. The broader implications of a successful outcome of this project are threefold. First, it will increase the breadth of the application markets for visible displays, especially advanced pixelated display systems, including TV systems. Second, it will add to the fundamental materials science and device engineering knowledge of a relatively unexplored materials system. Finally, low cost LEDs with optimal chromaticity will enable "tuned" white light sources without the current need to coat blue-emitting LEDs with phosphors and filtering.Technical Description:The goal of this proposal is to develop a lattice-matched, heterovalent compound semiconductor materials system and epitaxy technology to realize efficient and integrated LEDs that will cover the entire spectrum from near IR to blue wavelengths, especially "true green" (555 nm wavelength). The targeted materials system and epi-technology is (ZnSe)x(GaAs)1-x epilayers on ZnSe or GaAs substrates and Molecular Beam Epitaxy (MBE), respectively, and employs a novel method to develop homogeneous epilayers. The specific aims of this research are to 1) develop a recipe for the growth of ZnSe on GaAs based on the configuration of our MBE system, 2) identify the optimal epitaxial growth procedure of quaternary alloys of (ZnSe)x(GaAs)1-x, and 3) fabricate Double-Heterojunction (DH) devices with (ZnSe)x(GaAs)1-x composition tuned for "true green" LEDs. With the knowledge gained in this research, a single commercial materials system and a unified fabrication technology that can produce a wide spectral range of light emitting devices, laser, and solar concentrator chips can be realized. Equally important, the results are expected to have a positive translational impact because it is probable that success in unifying light emitters using a (ZnSe)x(GaAs)1-x system would have a huge impact on the photonics community both in industry and academia, especially those who would produce multi-colored pixel arrays. This in turn will open up new avenues for the community to explore both new heterovalent epitaxy principles and new applications that take advantage of integration of lattice-matched heterovalent direct band gap materials systems.

摘要非技术描述：尽管在过去的55年中，在开发可见光发光二极管（led）方面取得了巨大的进步，用于需要红色，绿色和蓝色发射器的应用，但至少需要两种不同的材料系统来实现仅具有所需的近似色调和色彩特性（色度）的系统。这是一个主要问题，因为必须使用两种不同的材料技术，增加了生产具有红、绿、蓝元素（像素）的显示器的巨大成本，例如公共场所的记分牌。此外，目前的技术不能在显示系统中产生最佳的色度。这两种系统都不能有效地产生所需的“真”绿色。因此，高成本和非最佳色度的结合阻碍了电视系统彩色图像像素化显示器的使用；现代电视系统使用廉价的白光发光二极管作为光源，使液晶像素化电视图像可视化。因此，本研究的目标是进行基础材料科学和构建探索性设备，以实现统一的技术，以降低制造生产成本并提高可见显示应用的色度。如果这个项目取得成功，其更广泛的影响有三个方面。首先，它将增加可见显示器的应用市场的广度，特别是先进的像素化显示系统，包括电视系统。其次，它将增加一个相对未开发的材料系统的基础材料科学和器件工程知识。最后，具有最佳色度的低成本led将使“调谐”白光光源成为可能，而无需为蓝色发光led涂上荧光粉和滤波。技术描述：本提案的目标是开发一种晶格匹配的异价化合物半导体材料系统和外延技术，以实现高效集成的led，覆盖从近红外到蓝色波长的整个光谱，特别是“真绿”（555nm波长）。目标材料体系和外延技术分别是（ZnSe）x(GaAs)1-x薄膜在ZnSe或GaAs衬底和分子束外延（MBE）上，并采用了一种新的方法来开发均质薄膜。本研究的具体目标是：1)根据我们的MBE系统的配置，开发一种在GaAs上生长ZnSe的配方；2)确定（ZnSe）x(GaAs)1-x的季元合金的最佳外延生长过程；以及3)制造双异质结（DH）器件，其中（ZnSe）x(GaAs)1-x成分调谐为“真正的绿色”led。利用本研究中获得的知识，可以实现单一的商用材料系统和统一的制造技术，可以生产宽光谱范围的发光器件，激光和太阳能聚光芯片。同样重要的是，该结果预计将产生积极的转化影响，因为使用（ZnSe）x(GaAs)1-x系统统一光源的成功可能会对工业界和学术界的光子学社区产生巨大影响，特别是那些将产生多色像素阵列的人。反过来，这将为社区探索新的异价外延原理和利用晶格匹配的异价直接带隙材料系统集成的新应用开辟新的途径。