Tricolor Pattern Design: Ultrahigh Thermal Conductivity Phosphor-in-Glass Film for Laser Illumination

Solid-state laser lighting has gradually become dominant in the display and illumination market, benefiting from its high efficiency and ultrahigh luminescence properties. Herein, by intelligently designing glass components and minor BN addition, a high-transparency and heat-resistant phosphor-in-glass film (PiGF) (a zero-thermal-quenching phenomenon) is realized. Further, in an attempt to take into account both the excellent luminous performance and the high quality of the light colors, a uniquely designed tricolor pattern of PiGF (THP-PiGF) was fabricated as an alternative to high-power white laser illumination. Under the excitation of a 450 nm blue laser diode (LD), a luminous efficiency (LE) of 159.87 lm/W with high color rendering index (CRI = 87.2) is achieved at 9.32 W/mm2. THP-PiGF with ultrahigh thermal conductivity (16.984 W/(m K)) can withstand a long operation time of 300 min under constant incident blue laser illumination. With respect to practical applications, a high-power laser module (maximum power 74 W) is assembled with the unique PiGF which can emit an interesting THP. These contributions can substantially drive the development of state-of-the-art laser light illumination.