This paper presents a comprehensive analysis of white light generation and the associated aging dynamics using high-power blue laser diodes (LDs) combined with transmissive single crystal remote YAG phosphors. By systematically varying input currents (ranging from 0.6 A to 3 A) and phosphor thicknesses (250 μm and 500 μm), this study elucidates the optical and electrical characteristics of LD-phosphor systems under diverse operating conditions. The results highlight the system’s potential for stable and efficient white light generation, making it suitable for high-power lighting applications. Experimental setups included both single LDs and a 4 × 2 LD array. For the single LD, a peak optical output of 4.16 W was achieved at 3 A, corresponding to an initial luminous flux of approximately 700 Lm and a correlated color temperature (CCT) of 4653 K, with minimal color temperature shift observed during a 60 min aging process. The 4 × 2 LD array demonstrated consistent white light output across varying phosphor thicknesses, with maximum luminous fluxes of 1857 Lm at 1.4 A and 2622 Lm at 1.6 A for phosphor thicknesses of 250 μm and 500 μm, respectively. Importantly, the phosphor exhibited excellent thermal stability throughout the aging process, with the CCT maintained within a range of 4600 K to 5500 K. These findings underscore the reliability and applicability of LD-based white light systems in demanding high-power lighting environments, offering a promising alternative to conventional light sources for automotive, industrial, and specialized lighting applications.

This study experimentally evaluates two Ce³⁺ single-crystal phosphor configurations and implements a laser-diode-driven remote-phosphor (LDRP) module for high-intensity searchlight applications. Phosphor plates with thicknesses of 0.71 and 1.24 mm were characterized under excitation from a 450 ± 5 nm blue laser-diode array. Photometric, colorimetric, and 20-min temporal measurements were performed at selected drive currents between 1.2 and 2.2 A. At 2.0 A, the 0.71 mm phosphor produced approximately 12.5% higher luminous flux than the 1.24 mm phosphor, mainly because its shorter optical path increased the contribution of residual blue light. The 1.24 mm phosphor exhibited smaller current-dependent chromaticity variation. The 0.71 mm phosphor maintained stable output up to 2.0 A but fractured shortly after the application of 2.2 A. In contrast, the 1.24 mm phosphor remained stable at 2.2 A without measurable flux degradation during the 20-min measurement interval. The 1.24 mm phosphor was therefore employed in the integrated module. The module was characterized at 11.84 V and 2.202 A, corresponding to an electrical input power of 26.07 W. It produced near-white emission with chromaticity coordinates of (0.3123, 0.3434). Far-field goniophotometry measured a peak luminous intensity of 280 kcd with an FWHM beam divergence of 2.5°. The estimated on-axis illuminance was 1.12 lx at 500 m under clear atmospheric conditions; this value represents a theoretical propagation estimate rather than a direct field measurement. These results demonstrate the measured trade-off between luminous output and chromaticity stability, together with the different luminous-flux behaviors observed for the two evaluated configurations during the 20-min measurement interval.