Abstract
In this work, a phosphor converter with small thickness and low concentration, based on a micro-angle tunable tilted filter (ATFPC), was proposed for hybrid-type laser lighting devices to solve the problem of silicone phosphor converters’ carbonizing under high-energy density. Taking advantage of the filter and the scattering characteristics of microphosphors, two luminous areas are generated on the converter. Compared with conventional phosphor converters (CPCs), the lighting effects of ATFPCs are adjustable using tilt angles. When the tilt angle of the micro filter is 20°, the luminous flux of the ATPFCs is increased by 11.5% at the same concentration; the maximum temperature (MT) of ATFPCs is reduced by 22.8% under the same luminous flux and the same correlated color temperature (CCT) 6500 K. This new type of lighting device provides an alternative way to improve the luminous flux and heat dissipation of laser lighting.
Highlights
Because of its excellent energy density, slope efficiency and brightness, laser light is in wide use in headlights, high resolution display [1,2,3,4]
The results showed that integrating the spectra, the luminous flux of the conventional phosphor converters (CPCs) and the ATFPCs was obtained in the total flux of the CPCs increased with increasing concentration, and ATFPCs were simiFigure 7c
The intensity distribution of ATFPCs was uneven due to the reguiding of the microworktilted proposed type of adjustable lighting system with enhanced luangleThis tunable filter. aInnew the normal of the filter,laser the intensity was stronger than in the minous flux and heat dissipation using a tunable angle to recycle laser
Summary
Because of its excellent energy density, slope efficiency and brightness, laser light is in wide use in headlights, high resolution display [1,2,3,4]. Liquid crystal display (LCD) provide enough high luminous flux to ensure the brightness of certain pixels Such laser lighting systems have great potential [5,6], and researchers are committed to the continuous development of laser sources and phosphor converters. To package and protect the phosphor, it is proportionately dispersed in the matrix [7], which has phosphor powder bonding material that includes polymers (e.g., epoxy resin and silicone) and inorganic materials (e.g., glass, ceramics, and single crystals) [8,9] Based on these materials, considerable research has been carried out on improving luminous flux, uniformity of the correlated color temperature and temperature stability [10,11,12,13,14,15]. Pan et al [18] analyzed the influence of pyramid microstructures on the optical efficiency of luminous elements and found that, after optimizing the density and angle of the pyramids, the PE of the chip increased from
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