Extending the life of LEDs – Part 1:
The LED industry is one of the fastest growing markets; despite LEDs being present in many electronic devices for a number of years, more recent developments in this industry have lead to their vast array of use in all types of lighting, signage and domestic appliance products, to name but a few. In offering alternatives to halogen, incandescent and fluorescent lighting systems for both interior and exterior applications, the growth of the LED lighting market alone is expected to grow into a $70 billion industry by 2020; a growth from 18% market share to 70% market share in just over 5 years. (Forbes) The growth is attributed to the advantages LEDs offer over traditional lighting forms in terms of adaptability, lifetime and efficiency; they allow more design freedom, offer an exceptionally long life time and they are also considerably more efficient, converting the majority of energy to light and thus minimising the heat given off.
Although LEDs are considerably more efficient than traditional lighting forms, they do still produce some heat. This heat can have an adverse effect on the LED and therefore must be managed to ensure the true benefits of this technology are realised. Typically categorised by colour temperature, LEDs are available in a huge number of colour variants. With a change in operating temperature of the LED, a change will also occur to the colour temperature; for example, with white light an increase in temperature could lead to a ‘warmer’ colour being emitted from the LED. In addition, if a variance in die temperatures is present across LEDs in the same array, a range of colour temperatures may be emitted, thus affecting the quality and cosmetic appearance of the device.
As shown in the table above, maintaining the correct die temperature of the LED can not only extend the life but also lead to more light being produced and therefore, fewer LEDs may be required to achieve the desired effect. Therefore, an increase in operating temperature can have a recoverable effect on the properties of the LED, however if excessive junction temperatures are reached, particularly above the maximum operating temperature of the LED (~120-150
Is Cleaning Critical to POP Assemblies
Cleaning is a critical process in the electronics manufacturing industry. Effective cleaning improves product reliability by ensuring optimal surface resistance and preventing current leakage that can lead to PCB failure. This paper addresses the cleanliness level of package-on-package (PoP) assemblies, including underneath PoP components and in between packages.
You will learn:
This webinar provides an overview of power module cleaning requirements, how to select a suitable cleaning process and the benefits that can be provided by modern water-based defluxing chemicals specifically designed for this application.
Fast, easy advanced training online – right at your desk
Live stream – our consultants are broadcast live via webcam
Discuss your questions with experts in real time
Brief summary of the presentation after the training for future reference
Guan Tatt Yeoh
ZESTRON South Asia
Senior Application Engineer
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