| dc.description.abstract | Abstract
In 2014, TI Texas Instruments developed a combination of blue laser and phosphor powder as a light source for projectors. Laser phosphor glass (PIG, Phosphor in Glass) became an important optical component; the bottlenecks in sintered PIG production are: The complicated process, difficult to control the structure, difficult to manufacture special shapes, high processing cost, high-temperature sintering energy consumption, and poor optical efficiency have caused limitations in applications.
In this paper, YAG 550nm phosphor powder with a particle size of 15μm is used to make LT-PIG laser fluorescent glass with a low-temperature reaction process. It is irradiated with a blue laser beam with a wavelength of 2W and 450nm. After penetrating a thickness of 0.49mm, the color temperature is maintained at 4300K , The luminous angle is above 150°.
The overall advantages are:
(1) Large astigmatism angle; the traditional PIG light angle is less than 90° depends on the lens astigmatism, LT-PIG does not need the lens, the light angle can reach 150°.
(2) The low-temperature process is simple, fast, accurate, energy-saving, and low-cost; it can be produced by multiple methods such as printing, deposition, casting, and molding.
(3) Inorganic glass materials can withstand high temperatures above 400°C; no yellowing and qualitative problems.
(4) It is easy to make curved surface, special shape and make on lens surface and other applications.
(5) High light efficiency; the internal uniform mixing structure can form a diffusion effect without going through the lens to obtain a large light angle.
(6) Reduce the lens; LT-PIG fluorescent film can be made on the surface of the lens, and the convergence angle of the light will not be caused by the optical loss due to the optical path or the lens receiving size is not large enough, which can minimize the size of the lens.
(7) It is easy to modulate the parameters of the light source; it is easy to adjust the particle size, film thickness and solid content ratio of the phosphor according to the intensity of the incident blue light. It is easy to control the color temperature, light angle, light shape and light intensity.
In summary , LT-PIG already has complete practical conditions, which can improve the existing PIG bottleneck, and then cooperate with related structural design will be the ideal light source choice. | en_US |