CAREER: Towards highly efficient UV emitters with lattice engineered substrates

事业：采用晶格工程基板实现高效紫外线发射器

• 批准号: 2338683
• 负责人: Shubhra Pasayat
• 金额: $ 55万
• 依托单位: University of Wisconsin-Madison
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-07-01 至 2029-06-30
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2338683&HistoricalAwards=false
• 关键词: CAREER; Towards; highly; efficient; UV

The objective of this CAREER project is to significantly improve the efficiency of light emitting diodes in the ultraviolet range, especially in those ranges where incumbent methods show an abrupt drop in efficiency. A new class of flexible materials will be used that will help improve strain related issues faced by this class of ultraviolet emitters, and these materials will also direct light in a specific direction to efficiently extract light out of the device. A combination of experimental and theoretical investigations will be employed to demonstrate light extraction, material, and device level improvements all resulting in up to 10x improvement over current solutions. The developed structures will not only enhance the capabilities of currently available products but will also enable completely new applications in the field of medical science – skin disease treatments and cardiovascular/eye surgeries, agriculture – food storage and farming, sanitization- air, surface and water; energy savings from efficient devices resulting in sustainability and finally improve reliability of security systems used in banks and for ID cards. The broader impacts activities will involve assessing the impact of proposed research and large-scale adoption of ultraviolet emitters over incumbent mercury lamps on various fields such as biodiversity, medicine and food security. Incorporation of a module on ”semiconductors are fun” in high school curriculum is proposed by leveraging the research experience for teachers program to introduce semiconductors and their societal impacts early on in the education system. Different kinds of workforce trainings at various levels – precollege, undergraduate and graduate level are proposed to fill the national level workforce shortage demand owing to the encouraging CHIPS Act related initiatives. Community engagement activities are planned with farming communities to generate awareness about ultraviolet emitters and how they can enhance national food security.Technical description: This CAREER project aims to address the gap in external quantum efficiency of III- nitride solid state emitters in the ultraviolet emission wavelength range of 280-365 nm to enable a new regime of high-power ultraviolet light emitting diodes. There is a sharp wavelength dependence on the efficiency of devices in this wavelength range, that will be decoupled by the proposed solution. The research approach will involve the development of mechanically compliant and reflective substrates based on porous semiconductors, to redefine the critical thickness metrics used to design group III-nitride based device epitaxial structures to achieve a projected efficiency improvement by an order of magnitude. Using novel quantum well and carrier injection layers, new methods of synthesis of porous materials, and implementation of semiconductor reflectors will be employed. Mechanical, optical and opto-electrical computational models will be developed to guide experimental explorations and enhance the understanding of the mechanics and physics of the epitaxial structures being used.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该职业项目的目的是显着提高紫外线范围内发光二极管的效率，尤其是在那些现有方法显示效率突然下降的范围内。将使用一类新的柔性材料，有助于改善此类紫外发射器所面临的应变相关问题，并且这些材料还将指导光线朝着特定的方向指导，以有效地将光线从设备中提取出来。将进行实验和理论投资的组合，以证明光提取，材料和设备水平的改进​​，所有这些都比当前解决方案提高了10倍。开发的结构不仅将增强当前可用产品的功能，而且还将在医学领域实现全新的应用 - 皮肤病治疗和心血管/眼科手术，农业 - 食品存储和农业，卫生，空气，表面和水；从高效设备中节省的能源，导致可持续性，并最终提高银行和身份证中使用的安全系统的可靠性。更广泛的影响活动将涉及评估拟议的研究和大规模采用紫外线发射器对现有汞灯在生物多样性，医学和粮食安全等各个领域的影响。在高中课程中，提出了在“半导体很有趣”上的模块，提出了利用教师计划的研究经验来引入半导体及其在教育系统的早期引入社会影响。提议各种级别的劳动力培训 - 曾提出，预科，本科生和研究生层面，以满足国家一级的劳动力短缺需求，这是由于“令人鼓舞的CHIPS法案相关计划）。 Community engagement activities are planned with farming communities to generate awareness about ultraviolet emitters and how they can enhance national food security.Technical description: This CAREER project aims to address the gap in external quantum efficiency of III- nitride solid state emitters in the ultraviolet emission wavelength range of 280-365 nm to enable a new regime of high-power ultraviolet light emissions.在此波长范围内，对设备的效率有急剧的波长依赖性，该波长将被提出的溶液解耦。该研究方法将涉及基于多孔半导体的机械符合机械和反射性底物的开发，以重新定义用于设计基于III氮化器的设备外延结构的临界厚度指标，以通过命令级实现预测的效率提高。使用新型的量子井和载体注入层，将采用新的多孔材料合成方法，并采用半导体反射器的实现。将开发机械，光学和光电计算模型，以指导实验探索并增强对所使用的外延结构的力学和物理学的理解。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子和更广泛的影响审查标准来通过评估来通过评估来支持的。