Browsing by Author "Luo, X."

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    Effect of phase change materials on the optical path of LEDs for opto-thermal enhancement
    (IEEE, 2023-05) Azarifar, M.; Arık, Mehmet; Xie, B.; Luo, X.; Mechanical Engineering; ARIK, Mehmet
    A novel concept based on the encapsulation of transparent phase change materials (PCMs) into the optical packaging structure of light-emitting diodes (LEDs) is presented in this article. The concept was initiated by challenges of thermal management of photoluminescent particles in high-power optical systems. LEDs, white LEDs (WLEDs), and porous/network-based photoluminescent matrices can achieve improved thermal networks by embedding PCMs. In this article, paraffin is selected as a suitable PCM encapsulant, and aside from thermal perspectives, an unexpected optical benefit with melted paraffin after surface wetting of the chip was observed. Immersing an LED chip in a melted paraffin pool showed up to an 8% increase in light extraction efficiency and a 1.5% increase in power conversion efficiency (PCE). An accurate dynamic opto-electro-thermal monitoring of studied devices was used to support the proof of concept. This viable method can be integrated into current industrial packaging processes.
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    Time-series models of pricing the impact of marketing on firm value
    (Edward Edgar Publishing, 2012-05) Luo, X.; Pauwels, Koen Hendrik; Hanssens, D. M.; Business Administration; PAUWELS, Koen Hendrik
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