Thermal transient analysis of high power LED tested on Al2O3 thin film coated Al substrate
|International Journal of Engineering Trends and Technology (IJETT)||
|© 2015 by IJETT Journal|
|Year of Publication : 2015|
|Authors : Shanmugan S, Mutharasu D
|DOI : 10.14445/22315381/IJETT-V30P251|
Shanmugan S, Mutharasu D"Thermal transient analysis of high power LED tested on Al2O3 thin film coated Al substrate", International Journal of Engineering Trends and Technology (IJETT), V30(6),270-275 December 2015. ISSN:2231-5381. www.ijettjournal.org. published by seventh sense research group
Aluminium Oxide (Al2O3) thin film was prepared on Al substrates by RF sputtering and used as heat sink material for high power Light Emitting Diode (LED). The thermal transient analysis was performed for the given LED and evaluated the parameters such as total thermal resistance, rise in junction temperature and the thermal resistance of interface material (Al2O3). The Rth-tot value of LED was low for 500 nm Al2O3 thin film boundary condition tested at 150 mA driving current and observed the difference in Rth-tot (?Rth-tot) was high (3.1 K/W) when compared to bare Al boundary condition. Improved reduction in TJ of LED (? TJ = 2.4°C compared with 400 nm Al2O3 boundary condition and ?TJ = 1.9°C compared with bare Al) was achieved with 500 nm boundary condition measured at 350 mA. The surface morphology of Al2O3 thin film was also evidenced for the observation from cooling transient curve as smooth with more no. of contact points.
 Thermal Management for LED Applications, Solution
guide, The Bergquist Company. West 78th Street
Chanhassen, MN. [Online]. Available:
 R. Prasher. (2006, Aug). Thermal Interface Materials: Historical Perspective, Status and Future Directions. Proceedings of the IEEE Dept. of Mech. & Aerosp. Eng. [Online]. 94(8), pp. 1571 – 1586. Available: http://ieeexplore.ieee.org/stamp/stamp.jsp?tp=&arnumber= 1705143
 S. P. Singh, K. Pal, A. Tarafder, T. Hazra and B. Karmakar. (2010, April). Influence of SiO2 and Al2O3 Fillers on Thermal and Dielectric Properties of Barium Zinc Borate Glass Microcomposites for Barrier Rib of Plasma Display Panels (PDPs). Transactions of the Indian Ceramic Society. [Online]. 69(2), pp. 75-82. Available: http://cgcri.csircentral.net/912/1/927-AT-ICS-Trans.pdf
 P. Bujard. G. Kuhnlein, S. Ino and T. Shiobara, “Thermal conductivity of molding compounds for plastic packaging”, IEEE Transactions on Components, Packag. Manufact. Tech. Part A, vol. 17, no 4, pp 527-532, Dec 1994.
 F. Mirjalili, L. Chuah, M. Khalid and M. Hasmaliza, “Effect of nano ? -Al2O3 fillers and dispersant on thermal and dynamic mechanical properties of polypropylene/nano ? -Al2O3 composite”, J. Thermoplast. Comp. Mat., vol 25, no 4, pp 453-467, June 2012.
 S. Shanmugan and D. Mutharasu, “Performance of LED employing metal oxide mixed thermal interface material by structure function analysis”, Int. J. of Pow. Electr. and Dri. Syst, vol 3, no 4, pp 409-416, Dec 2013.
 C.V. Madhusudana, “Thermal Contact Conductance”, in Springer, 2nd ed, Verlag New York (1996).
 Yovanovich M.M., Marotta E.E.: “Thermal Spreading and Contact Resistances," in Heat Transfer Handbook, A. Bejan and A.D. Kraus, Editors, Hoboken, NJ: John Wiley & Sons, pp. 261?395, (2003).
 D. Mutharasu, S. Shanmugan, P. Anithambigai and Z.Y. Ong, “Performance testing of 3-W LED mounted on ZnO thin film coated Al as heat sink using dual interface method”, IEEE Transac. Elect. Dev.,vol 60, no 7, pp 2290- 2295, July 2013.
 F. E. Ghodsi, M. Mafakheri, and A. Novinrooz, “Effect of annealing temperature on the optical and structural properties of dip-coated al2o3 thin films prepared by sol– gel route”, Surf. Rev. Lett., vol 12, no 5, pp 793- 797, Dec 2005.
 Properties of Aluminium, [Online]. Available http://www.infoplease.com/periodictable.php?id=13 (2005).
 Properties of sapphire, [Online]. Available http://www.mtberlin.com/frames_cryst/descriptions/sapphi re.htm
 P. J. Karditsas and M. J. Baptiste, “Thermal andStructural Properties of Fusion Related Materials". United Kingdom Atomic Energy Agency (UKAEA) Fusion 294, Euratom/UKAEA Fusion Association, San Diego, 1995.
LED, Al2O3, thin film, thermal transient analysis and surface properties..