Enhancing the thermal dissipation of a light-converting composite for quantum dot-based white light-emitting diodes through electrospinning nanofibers

Nanotechnology
Huai ZhengRong Sun

Abstract

Quantum dots (QDs) have been developed as one of the most promising light-converting materials for white light-emitting diodes (LEDs). In current QD-based LED packaging structures, composites of QDs and polymers are used as light-converting layers. However, the ultralow thermal conductivity of such composites seriously hinders the dissipation of QD-generating heat. In this paper, we demonstrate a method to enhance the thermal dissipation of QD-polymer composites through electrospinning polymer nanofibers. QD-polymer films embedded by electrospun nanofibers were prepared. Benefitting from aligned polymer chains in the electrospun nanofibers, the through-panel and in-panel thermal conductivities of the proposed QD-polymer film increased by 39.9% and 423.1%, respectively, compared to traditional QD-polymer film. The proposed and traditional QD-polymer films were both packaged on chip on board (CoB) LEDs for experimental comparison. Compared to traditional QD-polymer film, the luminous flux and luminous efficiency of the LEDs were increased by up to 51.8% and 42.9% by the proposed QD-polymer film under a current of 800 mA, respectively. With an increase in the driving current from 20-800 mA, the correlated color temperature (CCT) v...Continue Reading

References

Nov 13, 2007·Journal of the American Chemical Society·Patrick T K ChinRené A J Janssen
Jul 28, 2006·Nanotechnology·W E Teo, S Ramakrishna
Mar 9, 2010·Nature Nanotechnology·Sheng ShenGang Chen
Jul 7, 2011·ACS Nano·Thomas Nann, William M Skinner
Nov 5, 2014·The Review of Scientific Instruments·Carlo CanettaArvind Narayanaswamy

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