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MicroLED改善微型照明应用 - China Medical Device Manufacturer
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Wed, January 17th, 2018

2008 秋季刊 » 技术新知
MicroLED改善微型照明应用

图为0.125mm塑料光纤中的微型LED耦合灯。

Tyndall国家研究院(爱尔兰,Cork;www.tyndall.ie)致力于解决半导体光源面临的难题。研究项目完成时,研究院也开发出了微型照明应用的全新光源:微型LED (LED)。

研究人员表示,自支撑氮化镓基微型发光管与目前使用的二极管相比,体积更小、效率更高,还可作为激光的替代产品,而激光产生的热量会在某些应用中,如病人组织或液体样本检测,出现一定问题。微型LED产生的热量较少,因而造成分析材料发生状态改变的可能性较小。该产品的可能用途包括血液样本检测所用的光纤探头和内置芯片。

影响半导体中光的提取效率的原因是全反射作用,导致许多光线不能释放,这导致电能在转化为光能的过程中出现严重的效率损耗现象。Tyndall研究院的应用专家Bill Henry先生说:我们通过对半导体进行整形改进,力争使降低该损耗,将几乎所有光线都释放出来并非绝无可能。

Tyndall在发光区域周围设置了封闭系统以提高提取效率。封闭系统应具有较高的高度-直径比,以使原本遭到吸收的所有光线发生偏转。研究人员选择抛物线状的反射体,发现几乎全部光线都可从半导体中提取出来。Henry先生对此表示:抛物线的透射效果能使光线形成准平行光束,这使微型LED完全适用于光线需靠近应用部位的情况,或者可能受到杂散光影响时, 。

微型LED的效率和提取技术可以将产生的热量降到最低水平,并简化仪器的设计。据研究人员介绍,事实上,微型LED的提取效率比传统LED高出8倍。

微型LED在玻璃和塑料光纤中的耦合效率同样很高,且有各种颜色可供选择。这些特性使其适用于微流体、实验室芯片和手持医疗器械等主要受功耗影响的应用。Henry先生说:我们关注的是对于微型应用设备而言,平行光线的产生效率具有重要意义的领域。

Henry还进一步表示,除固定显示和低功耗可见指示器外,研究所还在探索微型LED在胶囊内窥镜、光学相干层析技术、光纤耦合光源和微型光谱,如毛细管电泳和液相色谱法等方面的应用。


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