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

Abstract

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/mm 2 . 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.

Rational Design of Nitride Phosphor-In-Glass with Robust Stability and Photoluminescence Performance

“…According to the Arrhenius equation, I T /I 0 = [1 + D exp (−E a /kT)] −1 , 37 the thermal activation energy (E a ) of PiG was calculated to be 0.47 eV (Figure 5e), surpassing that of PiS (0.17 eV). 46,47 Additionally, the thermal conductivity was measured to evaluate the thermal performance of the fluorescent composites. The thermal conductivity of PiG was0.40 W/(m• K), approximately 2.6 times higher than that of PiS (0.15 W/ (m•K)).…”