Visible light diodes ( LEDs ) are gaining wider and wider applications due to their long life and high reliability. LEDs have been used in cars, street lights, outdoor signs and so on. In addition, with the development of new colors and new critical applications, the need for cost-effective testing methods to ensure LED reliability continues to grow. With the advent of high brightness and organic LED technology , the measurement performance and capacity requirements of test equipment are also increasing.
LED luminescence is the result of the transition of charged particles between semiconductor energy gaps. The size of the energy gap determines the wavelength of the luminescence. The development of LEDs has produced surface and edge illuminating techniques that change performance specifications such as wavelength and power characteristics.
This article describes methods and issues for building a production test system solution for testing single and multiple (array) LED devices.
Test introduction
High performance LEDs typically require five tests. These include three tests on the DC spectrum (forward voltage, reverse breakdown and leakage current tests) and two tests on the spectrum (light intensity and wavelength check). In a production environment, usually only DC testing involves testing capacity issues. Optical tests, while useful, are usually slow and generally reserved for engineering or quality control experiments. The various test and test requirements are detailed below.
DC test
Figure 1 shows the test points for the three DC tests presented in this article.
Figure 1: Typical LED DC IV curve and test points (not for scaling)
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