Microspectrophotometers are used to test the color and intensity of each LED pixel and light source
Typical test spectra from different LEDs.
Microspectrometers are used for measuring the spectra, color and intensity of even the smallest LEDs.
Light emitting diodes, or LEDs, utilize molecular compounds to emit light. The basic LED is made of an a cathode, an emissive layer, a conductive layer, a substrate and an anode. Placing a charge across the layers causes the emission of photons from the emissive layer. Different types of atoms and molecules and different manufacturing processes result in various colors and display designs.
Due to the nature of light emitting diode devices, they can be manufactured by processes that cause rows of microscopic LEDs to be deposited on a surface. Such designs have led to the common use of LED devices as displays and light sources. They generate little waste heat and can yield a significant energy savings.
Development testing and quality control of both the components and completed LED devices is done by optical microspectroscopy. Microspectrometers, such as those made by CRAIC Technologies, are used to measure the spectra and the intensity of the output from individual devices and from groups of devices. They are even used to map the color and intensity outputs of entire displays. This is important as manufacturers of light emitting diodes need to make sure that all the different types of devices are the same color and brightness. A microspectrophotometer does this quickly and easily.
Learn about microscale LED analysis and testing: