Thermally Activated Degradation of Phosphor-Converted White LEDs
The increasing performances and long lifetime of High Brightness LEDs are still limited by the high temperatures involved. This work shows the results of several accelerated lifetime tests on 1W white LEDs. Two different tests have been carried out: a pure thermal storage at different temperatures and an electrical aging obtained by biasing the LEDs. The impact of high temperatures has been evaluated in terms of flux decay, chromatic properties modification, increase of forward voltage and thermal resistance. A picture of the main degradation mechanisms detected has been provided in detail.
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For Refrigeration Problems, a Magnetically Attractive Solution, Maybe for SSL Cooling too
![HOW IT WORKS: Conventional and magnetic refrigeration cycles use different physical effects to cool things off. [Top] When a gas is compressed (2), it heats up, but if it is cooled and then allowed to expand (3), its temperature drops much lower than it was originally (4); this principle keeps food in your home refrigerator cool. But a magnetocaloric material [bottom] heats up when magnetized (b); if cooled and then demagnetized (c), its temperature drops dramatically (d).](https://www.led-professional.com/technology/thermal-management/for-refrigeration-problems-a-magnetically-attractive-solution-maybe-for-ssl-cooling-too/nist_magnetic_fridge-jpg/@@images/2e859260-9ada-48d0-92e7-d53edd282a77.jpeg "HOW IT WORKS: Conventional and magnetic refrigeration cycles use different physical effects to cool things off. [Top] When a gas is compressed (2), it heats up, but if it is cooled and then allowed to expand (3), its temperature drops much lower than it was originally (4); this principle keeps food in your home refrigerator cool. But a magnetocaloric material [bottom] heats up when magnetized (b); if cooled and then demagnetized (c), its temperature drops dramatically (d).")
Electricity-guzzling cooling systems could soon be a lot smaller, quieter and more economical thanks to an exotic metal alloy discovered by an international collaboration working at the National Institute of Standards and Technology (NIST)’s Center for Neutron Research (NCNR).*
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Optek - Thermal Management - Introduction
Optek presents the research on heat management. Read more »
New technology has dramatic chip-cooling potential for future computers - a solution for LED lighting too?
Researchers have demonstrated a new technology using tiny "ionic wind engines" that might dramatically improve computer chip cooling, possibly addressing a looming threat to future advances in computers and electronics.
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New method to cool electronics, harness waste heat and sunlight
University of Utah physicists developed small devices that turn heat into sound and then into electricity. The technology holds promise for changing waste heat into electricity, harnessing solar energy and cooling computers and radars.
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