基於螢光片特性分析與量測之高亮度雷射白光

Abstract

在過去，LED固態照明技術改變了 21世紀的照明方式，雖然這些白光LED的發光效率都可以達150(lm/W)以上，但藍光LED仍然有一些顯著的性能限制，其中在高溫時的效率衰減現象限制了LED的發光功率，使得現今LED固態照明技術仍難以滿足高功率密度應用的需求。隨著高功率密度應用的需求的發展，雷射(LD)技術的研發越趨成熟，再加上雷射光在高電流密度下的表現與穩定度，相較於以往的LED照明，明顯表現優異許多。因此在本篇論文中希望能夠使用高電流密度之藍光雷射並搭配透鏡以及黃色螢光片以產生高亮度理想點光源，藉由不同濃度及厚度參數之螢光片，並搭配功率能量計量測可調變式之高電流密度藍光雷射之光瓦數、使用熱電耦量測溫度與時間之變化關係、使用紅外線熱影像儀(Fluke Ti32)量測螢光片之表面溫度、使用積分球量測頻譜及發光效率與量子效率和時間之關係，藉由以上方式在散熱與發光效率之間取得一平衡，並使用適合的螢光片以搭配後續的二次光學設計達到更進一步之應用。

In the past, LED solid-state lighting technology changed the way of 21st century lighting. Although these white LEDs can achieve efficiency of more than 150 (lm/W), but blue LED still has some significant performance limitations, including efficiency droop at high current density. The droop phenomenon limits the luminous power of the LED, making it difficult to meet the needs of high power density applications in today's LED solid state lighting technology. With the development of high-power density applications, the development of laser (LD) technology has become more mature, coupled with the performance and stability of laser light at high power, compared with the previous LED lighting, significantly better performance. Therefore, in this paper, it is desirable to be able to use high current density blue lasers with lenses and yellow phosphors to produce high-brightness, with different concentrations and thickness parameters of the phosphor. We use power meter (Thorlabs PM100D), thermocoupler, infrared thermal imager (Fluke Ti32), and the integrating sphere for measuring the watt of high current density blue laser light parameters, the relationship between temperature and time, the luminance with the surface temperature of the phosphors, and the spectrum and the relationship between luminance efficiency and quantum efficiency with time, respectively. We choose a suitable phosphor to match the subsequent secondary optics design for further application.