ABSTRACT This study focuses on advancing high‐performance color‐converting films for laser‐based white lighting through precise screen‐printing integration of YAG:Ce phosphors within a TiO 2 ‐α‐Al 2 O 3 ‐UV adhesive composite. This composite architecture ensures high uniformity, strong adhesion, and superior structural stability. Under high‐power blue LD excitation, the YAG phosphors enable broad wavelength conversion, while the TiO 2 and α‐Al 2 O 3 particles act as strategic scattering centers. The light‐scattering properties of TiO 2 and Al 2 O 3 are optimized by efficiently dispersing both laser and phosphorescent light, resulting in a homogeneous white light output. The system achieves a remarkable luminous efficacy of radiation (LER) of 426 lm/W and a luminous efficiency of 62.41%. Notably, the composite demonstrates exceptional thermal robustness, retaining ∼90% of the initial intensity at 150°C. Long‐term reliability was confirmed through 14 h of continuous operation without significant spectral degradation, highlighting the ability of the film to withstand intense thermal stress. By synergising YAG's conversion efficiency with Al 2 O 3 ’s thermal management and TiO 2 ’s optical scattering, this research provides a durable and efficient pathway for next‐generation, color‐tunable laser lighting systems.
Kumar et al. (Fri,) studied this question.