Abstract
Although the light-emitting diode (LED) has revolutionized lighting, the non-uniformity of its correlated color temperature (CCT) still remains a major concern. In this context, to improve the light distribution performance of remote phosphor LED lamps, we employ a micropatterned array (MPA) optical film fabricated using a low-cost molding process. The parameters of the MPA, including different installation configurations, positioning, and diameters, are optimized by combining the finite-difference time-domain and ray-tracing methods. Results show that the sample with the upward-facing convex-cone MPA film that has a diameter of half of that of the remote phosphor glass, and is tightly affixed to the inward surface of the remote phosphor glass renders a superior light distribution performance. When compared with the case in which no MPA film is used, the deviation of the CCT distribution decreases from 1033 K to 223 K, and the corresponding output power of the sample is an acceptable level of 85.6%. We perform experiments to verify our simulation results, and the two sets of results exhibit a close agreement. We believe that our approach can be used to optimize MPA films for various lighting applications.
Highlights
Solid-state lighting (SSL) devices, such as organic and inorganic light-emitting diodes (OLEDs and LEDs), realized using ecofriendly, energy efficient, and novel “green” technologies, are considered as powerful candidate for future lightings [1]
Results show that the sample with the upward-facing convex-cone micropatterned array (MPA) film that has a diameter of half of that of the remote phosphor glass, and is tightly affixed to the inward surface of the remote phosphor glass renders a superior light distribution performance
When compared with the case in which no MPA film is used, the deviation of the correlated color temperature (CCT) distribution decreases from 1033 K to 223 K, and the corresponding output power of the sample is an acceptable level of 85.6%
Summary
Solid-state lighting (SSL) devices, such as organic and inorganic light-emitting diodes (OLEDs and LEDs), realized using ecofriendly, energy efficient, and novel “green” technologies, are considered as powerful candidate for future lightings [1]. In 1994, Nakamura et al first developed a thermal annealing method for high-efficiency highintensity blue-LED mass production [3]. This breakthrough has led to GaN-based blue-light LEDs coated with down-conversion materials, such as aluminate phosphor [4] and quantum dot phosphor [5, 6], becoming one of the most popular approaches to realize white-light LEDs [2]. LED development still faces several challenges, and achieving uniform correlated color temperature (CCT) at different viewing angles is one of the major challenges
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