Export file:

Format

  • RIS(for EndNote,Reference Manager,ProCite)
  • BibTex
  • Text

Content

  • Citation Only
  • Citation and Abstract

Thermal and optical performance of chemical vapor deposited zinc oxide thin film as thermal interface material for high power LED

Nano Opto Electronic Lab (NOR), School of Physics, Universiti Sains Malaysia (USM) 11800 Minden, Penang, Malaysia

Topical Section: Thin films, surfaces and interfaces

In a solid-state lighting, the thermal performance of light emitting diode (LED) is one of the crucial aspects in determining the quality of the LED. To improve the thermal performance of LED, thermal interface material (TIM) was employed and proven to help the transfer of heat in solid state lighting. In this study, zinc oxide thin films were deposited on aluminum (Al) substrates using chemical vapor deposition method and the effect of annealing temperature was discussed. The thermal and optical performances of OSRAM golden dragon white LED attached on bare and ZnO thin film coated Al substrate were measured by Thermal Transient T3ster (T3ster) and Spectrometer respectively. Noticeable improvement in the reduction of junction temperature (ΔTj = 13.79 ℃) was observed for ZnO thin film annealed at 400 ℃ compared with the bare Al (without ZnO) boundary condition and hence improvement in optical output was achieved with the same boundary condition. Overall, rise in junction temperature, Tj of ZnO thin film demonstrated positive result in reducing the temperature of the LED package. The total thermal resistance (Rth-tot) was low for the sample coated with ZnO thin film compared with the bare Al substrate at high driving currents with the lowest reported value of 7.37 K/W for ZnO thin film annealed at 400 ℃. Correlated color temperature (CCT) and illuminance (LUX) value showed that the ZnO thin film sample displayed better performance than bare Al sample. From the result, it can be suggested that ZnO thin film would be an effective and suitable thermal interface material (TIM) for the solid-state lighting application.
  Figure/Table
  Supplementary
  Article Metrics

References

1. Alexander H, Maximilian S, Liu E, et al. (2015) Transient thermal analysis as measurement method for IC package structural integrity. Chinese Phys B 24: 068105.    

2. Schubert EF, Kim JK, Luo H, et al. (2006) Solid-state lighting—a benevolent technology. Rep Prog Phys 69: 3069.    

3. Shanmugan S, Mutharasu D (2014) Thermal Resistance Analysis of High Power Light Emitting Diode Using Aluminum Nitride Thin Film-Coated Copper Substrates as Heat Sink. J Electron Packaging 136: 034502.    

4. Chung DDL (2001) Thermal Interface Materials. J Mater Eng Perform 10: 56–59.    

5. Otiaba KC, Ekere NN, Bhatti RS, et al. (2011) Thermal interface materials for automotive electronic control unit: trends, technology and R&D challenges. Microelectron Reliab 51: 2031–2043.    

6. Koski K, Hölsä J, Juliet P (1999) Properties of aluminium oxide thin films deposited by reactive magnetron sputtering. Thin Solid Films 339: 240–248.    

7. Chao LC, Hu HT, Yang SH, et al. (2008) Effect of annealing on the properties of (100) ZnO films prepared by chemical vapor deposition utilizing zinc acetate dihydrate. Thin Solid Films 516: 6305–6309.    

8. Elilarassi R, Chandrasekaran G (2010) Effect of annealing on structural and optical properties of zinc oxide films. Mater Chem Phys 121: 378–384.    

9. Lu J, Ye Z, Huang J, et al. (2003) Synthesis and properties of ZnO films with (1 0 0) orientation by SS-CVD. Appl Surf Sci 207: 295–299.    

10. Zhang X, Weeks BL (2014) Effects on the surface structure of organic energetic materials using spin coating. Thin Solid Films 550: 135–139.    

11. Minami T, Nanto H, Shooji S, et al. (1984) The stability of zinc oxide transparent electrodes fabricated by R.F. magnetron sputtering. Thin Solid Films 111: 167–174.    

12. Jeyaprakash BG, Kumar RA, Kesavan K, et al. (2010) Structural and optical characterization of spray deposited SnS thin film. J Am Sci 6: 22–26.

13. Faÿ S, Kroll U, Bucher C, et al. (2005) Low pressure chemical vapour deposition of ZnO layers for thin-film solar cells: temperature-induced morphological changes. Sol Energ Mat Sol C 86: 385–397.    

14. Barnes TM, Leaf J, Fry C, et al. (2005) Room temperature chemical vapor deposition of c-axis ZnO. J Cryst Growth 274: 412–417.    

15. Bole MP, Patil DS (2009) Effect of annealing temperature on the optical constants of zinc oxide films. J Phys Chem Solids 70: 466–471.    

16. Cheng AJ, Tzeng Y, Zhou Y, et al. (2008) Thermal chemical vapor deposition growth of zinc oxide nanostructures for dye-sensitized solar cell fabrication. Appl Phys Lett 92: 092113.    

17. Oettinger FF, Blackburn DI (1990) Thermal Resistance Measurements, NIST Special Publication 400-86 from Series on Semiconductor Measurement Technology.

18. Yu JH, Farkas G, Vader QVV (2005) Transient thermal analysis of power LEDs at package & board level, In: THERMINIC 2005, Belgirate, Lago Maggiore, Italy: TIMA Editions, 244–248.

19. Jamaludin NJA, Shanmugan S (2018) Thermal performance of LED fixed on CVD processed ZnO thin film on Al substrates at various O2 gas flow rates. AIMS Mater Sci 5: 246–256.    

20. Malyshev VA, Glaeske H, Feller KH (1999) Exciton–exciton annihilation in linear molecular aggregates at low temperature. Chem Phys Lett 305: 117–122.    

21. Mah JW, Shanmugan S, Ong ZY, et al. (2016) Thermal substrates for efficient heat dissipation in LED packaging application. 2016 IEEE 37th International Electronics Manufacturing Technology (IEMT) & 18th Electronics Materials and Packaging (EMAP) Conference, 1–9.

22. Ohyama M, Kouzuka H, Yoko T (1997) Sol-gel preparation of ZnO films with extremely preferred orientation along (002) plane from zinc acetate solution. Thin Solid Films 306: 78–85.    

23. Kim YS, Tai WP, Shu SJ (2005) Effect of preheating temperature on structural and optical properties of ZnO thin films by sol-gel process. Thin Solid Films 491: 153–160.    

24. Lim J, Lee C (2007) Effects of substrate temperature on the microstructure and photoluminescence properties of ZnO thin films prepared by atomic layer deposition. Thin Solid Films 515: 3335–3338.    

25. Gocman K, Kałdoński T, Mróz W, et al. (2011) Structural and mechanical properties of boron nitride thin films deposited on steel substrates by pulsed laser deposition. J KONES 18: 149–156.

26. NLPIP: What Is Correlated Color Temperature? 2004. Available from: http://www.lrc.rpi.edu/programs/nlpip/lightinganswers/lightsources/whatisCCT.asp.

© 2018 the Author(s), licensee AIMS Press. This is an open access article distributed under the terms of the Creative Commons Attribution Licese (http://creativecommons.org/licenses/by/4.0)

Download full text in PDF

Export Citation

Article outline

Show full outline
Copyright © AIMS Press All Rights Reserved