A Luminous Efficiency-Enhanced Laser Lighting Device with a Micro-Angle Tunable Filter to Recycle Unconverted Blue Laser Rays

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.

Editorial for the Special Issue “Microsystem for Electronic Devices”

“…This Special Issue includes 12 high-quality papers focused on the development of microsystems. Half of the published papers focus on light-emitting diode (LED) microsystems and related microelectronic systems [4][5][6][7][8][9], three papers discuss the cooling techniques of electronic microsystems [10][11][12], and the final three papers present several mechanical microsystems [13][14][15].…”

“…This yielded promising results in terms of luminous efficiency (25%) and external quantum efficiency (16.43%), with the potential for the customization and future development of efficient and cost-effective SiC-based LEDs through the direct bonding of SiC-SiC wafers. We [5] developed a phosphor converter based on a micro-angle tunable tilted filter for hybridtype laser lighting devices to address the issue of carbonizing under high-energy density in silicone phosphor converters. The filter and scattering characteristics of phosphors generate two luminous areas on the converter, and the lighting effects can be adjusted using tilt angles.…”