An advanced laser headlight module employing highly reliable glass phosphor

An advanced laser headlight module (LHM) employing highly reliable glass phosphor is demonstrated. The novel glass-based YAG phosphor-converter layers fabricated by low-temperature of 750 degrees C exhibited better thermal stability. The LHM consisted of a 5 x 1 blue laser diode array, an aspherical lens, a glass phosphor-converter layer with an aluminum thermal dissipation substrate. and a dichroic filter to allow pass blue light and reflect yellow phosphor light. The 5 x 1 blue laser array was packaged with five blue lasers having optical power of 1.2 W per laser. The LHM exhibited total output optical power of 6 W, luminous flux of 1860 lm relative color temperature of 4100 K, and efficiency of more than 310 lm/W. The high-beam patterns of the LHMs were measured to be 45.000 luminous intensity (cd) at 0 degrees, 31,000 cd at +/- 2.5 degrees, and 12,500 cd at +/- 5 degrees, which were well satisfied the ECE R112 class B regulation. The proposed high-performance LHM with highly reliable glass-based phosphor-converter layer fabricated by low temperature is favorable as one of the promising LHM candidates for use in the next-generation automobile headlight applications. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement