FAIZ RAHMAN of the University of Ohio, Ohio, believes switching from LEDs to lasers for phosphor-pumped white light sources increases efficiency, extends lifetime and produces highly collimated beams. Currently, laser sources are based on semi-polar GaN laser diodes and incorporate advanced phosphor technology. As the laser focuses on a tiny spot on the phosphor that emits light and converts it to white light, the light source can output safe and highly collimated white light. Laser-based methods, whose properties include a much higher temperature rise than LEDs. Laser pumping is also practical because devices that emit in the near ultraviolet are readily available and can function effectively. The process of moving from LED to laser does not happen overnight. In contrast, LED-based luminaires will remain the primary means of generating white light for the foreseeable future. However, laser diode-based solid-state lighting systems have found application in high-brightness lighting...
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