NP2: Hybrid Nanoparticle-Nanoporous nitride materials as a novel precision manufacture route to optoelectronic devices

NP2：混合纳米颗粒-纳米多孔氮化物材料作为光电器件的新型精密制造途径

• 批准号: EP/X017028/1
• 负责人: Rachel Oliver
• 金额: $ 25.76万
• 依托单位: University of Cambridge
• 依托单位国家: 英国
• 项目类别: Research Grant
• 财政年份: 2022
• 资助国家: 英国
• 起止时间: 2022 至 无数据
• 项目状态: 未结题
• 来源: https://gtr.ukri.org/projects?ref=EP%2FX017028%2F1
• 关键词: NP2; Hybrid; Nanoparticle; Nanoporous; nitride

Augmented reality (AR) has the power to seamlessly integrate the digital world with physical reality. It could provide surgeons with vital medical data as they operate, allow athletes to access training information seamlessly whilst playing sports and offers countless other opportunities in business, leisure and beyond. However, currently AR technologies are let down by the performance of microdisplays. AR devices must operate successfully not only in darkened rooms but also in bright sunlight, and must also be very small and run all day on one charge of a compact battery. Hence, enormous demands are placed on tiny light emitters in microdisplays in terms of brightness and efficiency. For AR to become a mass market technology, any new approach to microdisplays will need to not only meet these demands, but also allow easy manufacturing.Current light emitting diodes (LEDs) fail to meet these needs, since key materials which work well for larger area light emitters exhibit a drop in efficiency when the device size is shrunk to meet the demands of form factor and resolution imposed by AR. However, in terms of large scale LEDs, devices based on gallium nitride (GaN) have been tremendously successful, transforming the lighting industry. GaN LEDs also show much lower drops in efficiency with reduction in size than other similar materials. Unfortunately, these GaN LEDs are highly efficient only for light emission in the blue region of the spectrum. Green, amber and particularly red devices based on the same materials have much lower efficiencies, but are needed to create full colour microdisplays. In white LED light bulbs, blue light is converted to other colours by phosphor materials, but these phosphors are manufactured as bulky micron sized powders, too coarse to be used in microLEDs.In this project, we will take a new approach to integrating alternative, nanometre-scale phosphor particles (ca. 100 atoms wide) with nitride LEDs. Our alternative phosphors are highly luminescent colloidal nanoparticles, synthesised straightforwardly in solution using scalable techniques and easily made into nanoparticle inks. These materials are already used in "QLED" display technologies, but display manufacture is complex and the difficulties increase substantially as the device shrinks. Our new concept is to use printing technologies to inject nanoparticles not onto the surface of LEDs, but into nanoscale pores in the GaN itself. The nanoporous GaN materials are a very recent development and unique, scalable methods for their fabrication have been invented in our laboratory. By printing onto these porous scaffolds we will exploit capillary action to suck the nanoparticles into the desired region of the device, preventing spreading of the nanoparticle ink and hence achieving controlled manufacture straightforwardly at the required scale. In so doing, we will create a new optical composite material - a combination of the GaN and the highly luminescent nanoparticles - and by using the structure of the nanopores to align and control the array of nanoparticles, we will enable new and more sophisticated devices, for future display technologies such as AR in three dimensions.

增强现实（AR）能够将数字世界与物理现实无缝集成。它可以为外科医生提供重要的医疗数据，让运动员在运动时无缝访问训练信息，并在商业，休闲等领域提供无数其他机会。然而，目前的AR技术被微显示器的性能所拖累。AR设备不仅必须在黑暗的房间中成功运行，而且必须在明亮的阳光下成功运行，而且必须非常小，并在紧凑型电池的一次充电下运行一整天。因此，在亮度和效率方面，对微型显示器中的微小光发射器提出了巨大的要求。为了使增强现实技术成为一项大众市场技术，任何新的微显示器方法都不仅需要满足这些需求，而且还需要易于制造。目前的发光二极管（LED）无法满足这些需求，因为当设备尺寸缩小以满足增强现实对形状因子和分辨率的要求时，适用于更大面积发光器的关键材料表现出效率下降。然而，在大规模LED方面，基于氮化镓（GaN）的器件取得了巨大的成功，改变了照明行业。GaN LED还显示出比其他类似材料低得多的效率随尺寸减小的下降。不幸的是，这些GaN LED仅对光谱蓝色区域的光发射高效。基于相同材料的绿色、琥珀色和特别是红色器件具有低得多的效率，但是需要创建全色微显示器。在白色LED灯泡中，蓝光通过磷光体材料转换为其他颜色，但这些磷光体被制造成笨重的微米级粉末，太粗糙而不能用于microLED。在这个项目中，我们将采取一种新的方法来集成替代的纳米级磷光体颗粒（约100微米）。100原子宽）与氮化物LED。我们的替代磷光体是高度发光的胶体纳米颗粒，使用可扩展的技术在溶液中直接合成，并易于制成纳米颗粒墨水。这些材料已经用于“QLED”显示技术，但显示器制造是复杂的，并且随着设备缩小，难度大大增加。我们的新概念是使用印刷技术将纳米颗粒注入到GaN本身的纳米孔中，而不是LED表面。纳米多孔GaN材料是一个非常新的发展和独特的，可扩展的方法，他们的制造已经在我们的实验室发明。通过在这些多孔支架上打印，我们将利用毛细作用将纳米颗粒吸入装置的所需区域，防止纳米颗粒油墨扩散，从而直接以所需规模实现受控制造。通过这样做，我们将创造一种新的光学复合材料-GaN和高发光纳米颗粒的组合-并通过使用纳米孔的结构来对齐和控制纳米颗粒的阵列，我们将使新的和更复杂的设备，用于未来的显示技术，如三维AR。

项目成果

Enhanced excitonic nature of MAPbBr3 nanocrystals in nanoporous GaN

纳米多孔 GaN 中 MAPbBr3 纳米晶体的增强激子性质

• DOI: 10.17863/cam.107518
• 发表时间: 2024
• 作者: Bai X