Silicon-Based White LED Packaging Module With an Integrated RGB Color Sensor

Abstract

This letter presents a silicon-based light-emitting diode (LED) packaging module with integrated red, green, and blue (RGB) color sensors, which can detect the variations in the brightness and specified wavelength intensity of white LEDs to evaluate the chromaticity and color temperature of emitting light in real time. The carrier substrate with color sensors was fabricated by semiconductor manufacturing technology and a deep silicon etching process was used to complete electrical division and thermal isolation. By integrating blue LED and silicone phosphor, a monolithic packaging module with miniaturization and low cost was achieved. A typical experimental result shows the output currents of the RGB color sensors as 0.082, 0.086, and 0.068 mA, respectively, when the input current to the LED is 0.2 A. The calculated chromaticity coordinates of x and y are 0.35 and 0.36, respectively, and the corresponding color temperature is 4852 K. These experimental results are consistent with the measurements of a commercial luminous meter.