EAGER: In-situ spectral phonon recycling in LED for improved thermal, power and performance efficiency

EAGER：LED 中的原位光谱声子回收可提高热、功率和性能效率

• 批准号: 2407260
• 负责人: Massoud Kaviany
• 金额: $ 12.52万
• 依托单位: Regents of the University of Michigan - Ann Arbor
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2024
• 资助国家: 美国
• 起止时间: 2024-02-15 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2407260&HistoricalAwards=false
• 关键词: EAGER; situ; spectral; phonon; recycling

Lighting consumes equivalent to 5% of total US electricity use according to US Energy Information Administration. The use of light emitting diodes (LEDs) has improved the lighting efficiency, but still more than 50% of the electrical energy is dissipated as heat (emitted phonons). Improving energy conversion and demonstrating timely and significant impact of phonon engineering using gallium-nitride GaN LED is the goal of this proposed EAGER. This will be done by adding a heterobarrier (HB) layer to the LED structure for a net absorption and recycling of phonon emissions that will provide improved power efficiency. The objectives are to theoretically predict the improvements and to fabricate and test the optimal design, aiming to demonstrate the proof-of-concept and make it available for technological implementations. Through collaboration with an GaN LED and display expert, the proposed improvement verifications can be implemented at commercial level resulting in significant national energy savings and enhanced device thermal management. Fundamental understanding and insightful use of the phonon-electron-photon interactions advance the heat transfer physics and engineering. The proposed research would be the first attempt at in-situ spectral-phonon recycling in LED using a graded HB. The research combines simulations of the phonon transport and recycling behavior to understand and advance the novel idea of phonon recycling, and also includes an experimental verification of the new concept. The one-year EAGER effort is therefore focused on demonstrating the new concept of phonon-recycling for LEDs, and if successful can provide significant paybacks in terms of energy savings. The proposed research advances the premise that the benefits of phonon-recycling via the HB is achieved through three distinct pathways: (a) reduced heat load resulting in a temperature decrease for LEDs (b) increased power efficiency, where the electric current in the LED harvests phonon energy, creating a net potential gain, and (c) enhanced photon emission spectra due to the net potential gain in the HB layer. The predictions in the proposed research use mesoscale (Boltzmann transport) interactions, which involves phonons, electrons and holes, and photons. The fabrication and testing/characterization of the optimal HB GaN LED will provide the first ever experimental demonstration of improvements in LED performance and energy savings via the use of a HB. The proposed research aligns with the Department of Energy solid-state lighting R&D goals for 2035 which would enable national energy savings equivalent to 3% of US energy consumption in 2022.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.

根据美国能源信息管理，照明的消耗相当于美国总使用量的5％。发光二极管的使用（LED）提高了照明效率，但仍有50％以上的电能消散为热量（发出的声子）。改善能量转换并使用甲氮化炮LED的声子工程的及时和重大影响是该渴望的目标。这将通过在LED结构中添加异性载体（HB）层来完成，以使声子排放的净吸收和回收利用将提供提高功率效率。这些目标是从理论上预测改进并制造和测试最佳设计，旨在证明概念验证并使其可用于技术实施。通过与GAN LED和展示专家的合作，可以在商业级别实施拟议的改进验证，从而大大节省全国能源并增强了设备的热管理。对声子 - 电子 - 光子相互作用的基本理解和有见地的使用推动了传热物理和工程。 拟议的研究将是使用分级HB在LED中首次尝试在LED中回收的尝试。该研究结合了声子传输和回收行为的模拟，以理解和推进声子回收的新思想，还包括对新概念的实验验证。因此，为期一年的渴望努力专注于展示LED的声子重合的新概念，如果成功的话，可以在节能方面提供大量的回报。拟议的研究推进了以下前提：通过三种不同的途径，通过HB进行声子重合的好处：（a）降低热负荷导致LED的温度降低（b）提高功率效率，其中LED收获声子中的电流会收获声子能量，从而获得净电位增益，以及（c）增强的光子发射范围的潜在净值增益，而HB则增强了nb hb hb hb hb hb hb hb hb hb by net net by by s hb hb s hb be by n b hb able效率的增强。拟议的研究中的预测使用中尺度（Boltzmann传输）相互作用，其中涉及声子，电子和孔以及光子。最佳HB GAN LED的制造和测试/表征将提供有史以来首次通过使用HB来改善LED性能和节能的实验证明。拟议的研究与2035年能源固态照明R＆D目标的一致，这将使国家能源节省能够在2022年获得美国3％的能源消耗。这项奖项反映了NSF的法定任务，并被认为是值得通过基金会的知识分子和更广泛影响的评估来审查审查标准的评估。