In this article, a ring remote phosphor (RRP) structure comprising an inverted-cone-lens encapsulant and a surrounding phosphor layer was developed and used for laser-driven white lighting. The inverted-cone-lens encapsulant in the structure redirects light from a blue laser diode (LD) to the surrounding phosphor layer, thus preventing intense light from hitting the phosphor layer on a small surface and, therefore, from considerably reducing luminous efficiency. The design of the inverted-cone-lens surface of the encapsulant was investigated, and 3-D ray-trace simulations were performed to confirm its light distributions. The RRP structure with an inverted-cone-lens encapsulant and a surrounding phosphor layer was fabricated to produce laser-driven white lighting, and the optical characteristics of the RRP structure with different phosphor concentrations were examined. The output luminous flux of the RRP samples increased with increased phosphor concentration, whereas the correlated color temperature (CCT) decreased with an increase in phosphor concentration. Therefore, the RRP structure can be used to generate efficiently high-brightness white light.

中文翻译：

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用于激光驱动白光的环形远程磷光体结构

在本文中，开发了一种包含倒锥形透镜密封剂和周围磷光体层的环形远程磷光体 (RRP) 结构，并将其用于激光驱动的白光照明。该结构中的倒锥形透镜密封剂将来自蓝色激光二极管 (LD) 的光重定向到周围的磷光体层，从而防止强光照射到小表面上的磷光体层，从而显着降低发光效率。研究了密封剂的倒锥形透镜表面的设计，并进行了 3-D 光线跟踪模拟以确认其光分布。制造具有倒锥形透镜密封剂和周围磷光体层的 RRP 结构，以产生激光驱动的白光，并研究了具有不同磷光体浓度的 RRP 结构的光学特性。RRP样品的输出光通量随着磷光体浓度的增加而增加，而相关色温（CCT）随着磷光体浓度的增加而降低。因此，RRP结构可用于高效产生高亮度白光。