Superhigh-Luminance Ce:YAG Phosphor in Glass and Phosphor-in-Glass Film for Laser Lighting

Abstract

Solid laser lighting with high photoelectric conversion efficiency and compact size has been increasingly vital in lighting applications. Extensive research has been conducted to obtain high-quality color converters for application to high-power and high-luminance laser lighting. Currently, Y3Al5O12:Ce3+ phosphor in glass (Ce:PiG) and Y3Al5O12:Ce3+ phosphor-in-glass film (Ce:PiF) possessing high efficiency, low cost, easy fabrication, and controllable chromaticity are becoming the most mainstream research directions. In this study, by modifying the glass particle size and sintering temperature, investigating the relevant host glass, and so forth, high-performance Ce:PiG was developed through a one-step co-sintering technology. It possesses a high internal quantum efficiency, approaching 100% of the original phosphors (92.5%). The luminous efficacy (LE) of the Ce:PiG was 240 lm/W at 2.18 W/mm2 under 450 nm blue laser diode (LD) excitation, which is the best result yet reported. Furthermore, to enhance the laser saturation threshold, the fabricated Ce:PiF relying on a sapphire substrate can withstand an 8 W/mm2 blue incident power density. The obtained sample can even reach an LE of 251.5 lm/W, which is an obvious improvement to Ce:PiG. In addition, the result, an LD module combined with the sample that meets the standard white light source, indicates that this work has good prospects for white laser lighting.

Design of a Novel La3Si6N11:Ce3+ Phosphor-in-Glass Film for High Power Laser Lighting: Luminous Efficiency toward 200 lmW–1

“…For other optical properties of the LSN PiF including QE and PL intensity provided in Figure b,c, when the temperature exceeds 1060 °C, they begin to decline. This is because the LSN:Ce phosphor will decompose when the temperature is too high and then react seriously with the glass . Consequently, the sintering temperature was kept at 1060 °C, and the holding time was changed from 10 to 20 min.…”

“…Currently, the light source being developed for commercial applications such as projectors and automotive headlights mainly combines blue laser diodes and Ce-doped yellow-emitting yttrium aluminum garnet (YAG:Ce). , Furthermore, the white light source which pursues high CRI and low CCT always plays a crucial part in the laser lighting field . In recent years, La 3 Si 6 N 11 :Ce 3+ (LSN:Ce), a burgeoning nitride phosphorescent material, has received a great deal of attention on account of its excellent chemical and thermal stability, and it is expected to become the potential light source of the white laser. , Compared with YAG:Ce, LSN:Ce fluorescent material can produce unique red emission.…”

“…This is because the LSN:Ce phosphor will decompose when the temperature is too high and then react seriously with the glass. 21 Consequently, the sintering temperature was kept at 1060 °C, and the holding time was changed from 10 to 20 min. When the holding time is 15 min, LSN PiF shows the highest PL intensity, as shown in Figure 2d.…”

A highly stable CsPbBr3–SiO2glass ceramic film sintered on a sapphire plate for laser-driven projection displays

“…In the Phosphor-in-Glass technique, the low-melting glass frit should have moderate softening temperature to reduce chemically aggressive components and keep the embedded phosphor intact. 40,41 Herein, the 33B 2 O 3 -10SiO 2 -40ZnO-5Li 2 CO 3 -6La 2 O 3 -6WO 3 (in mol%) glass was chosen as the host glass considering the preparation temperature of the CsPbBr 3 –SiO 2 powder. The differential scanning calorimetry (DSC) analysis showed that the glass transition temperature ( T g ) of the host glass is 541 °C (Fig.…”

Ultrahigh Power Density LuAG:Ce Green Converters For High‐Luminance Laser‐Driven Solid State Lighting

“…[5][6][7][8] Accumulation of large amounts of heat in the fluorescent converter, leading to the notorious thermal quenching phenomenon, which then affects the development of LD lighting. [9,10] Currently, in order to address the thermal extinction phenomenon that occurring in LD lighting for achieving better luminescence, numerous all-inorganic color converters including single-crystal phosphors , [11][12][13][14] phosphor in glasses (PiGs), [15][16][17][18] phosphor ceramics, [19][20][21] and phosphor in glass films (PiFs) [8,[22][23][24][25][26] are being extensively studied for their different properties. Among the aforementioned phosphor converters, although single-crystal phosphors and phosphor ceramics are prepared with excellent thermal stability, they are necessarily expensive due to their complicated process and high cost, which limits their popularity in the market.…”