An Investigation on the Optical Characteristic of the Phosphor-Converted White Light-Emitting Diodes-Based Flash Light Source of Commercial SmartphonePages 148-156
Huynh-Tuan-Anh Nguyen Abstract:
We experimentally investigated and evaluated the optical properties of a commercial smartphone's phosphor-converted white light-emitting diodes-based flash light source. Four types of smartphone flashlights including Samsung smartphone, iPhone 6, iPhone 12, and iPhone 13 were selected for investigation. The emission spectra revealed interesting information about each type of smartphone's light source optical properties. The difference in emission bands between different flashlight lamps is clearly shown in the wavelength of the cyan blue region (490 nm) and red light emission (640 nm), respectively. The general color rendering index (CRI) for four types of smartphone flashlights including Samsung smartphone, iPhone 6, iPhone 12, and iPhone 13 were 69.1, 62, 91.7, and 95.5, respectively. In addition, there is an interesting relation between high CRI values for smartphone lamp's emission spectrum and Sunlight spectrum, a higher similarity to Sunlight lead to a high CRI value for emission spectrum.
Keywords: Smartphone flashlight,
pcW-LEDs,
Optical propertie,
CRI,
CCT,
Phosphor
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