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Influence of composition ratio on the thermal performance of AlNB nanocomposite for an efficient heat spreading in solid-state lighting package (LED)

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Abstract

The demand for higher flux in light emitting diodes (LEDs) is associated with an increase in current density which impliedly leads to higher junction temperatures which affect the LEDs performance and operational life. It can be mitigated by minimizing the thermal path through the development and introduction of solid thermal interface material such as dielectric base. Consequently, the growth of AlNB composite based on varied Aluminium (Al) and Boron (B) thickness ratios (Al1−XNBX) for heat mitigation through heat spreading was performed using the reactive sputtering technique in N2:Ar gas ratios of 12:8 on Al substrates and annealed at 400 °C in N2 ambient. The surface microstructure and their variations are analyzed and observed the roughness in the range from 82 to 227 nm with an average particle size of ~ 200 nm. Surface cracks and thickness are measured from SEM analysis, while the structural characterization conducted by XRD confirmed the presence of Cubic aluminium nitride (c-AlN) (200 and 220), cubic boron nitride (c-BN) (111) and cubic aluminium (c-Al) (111 and 311) phases, respectively. The AlN and BN phases are also confirmed by FTIR spectra between ~ 545 and 1672 cm−1. Using the cumulative structure–function analysis, the noticeable reduction in total thermal resistance (Rthj-a) along the thermal path of the high power LED package is observed to be ~ 5.97 K/W compared with that of a bare aluminium substrate with 10.37 K/W. The lowest interfacial thermal resistance within the samples is found to be ~ 1.77 K/W and thus, the prepared AlNB composite highly recommended for effective heat spreading applications.

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Acknowledgements

The first author would like to acknowledge Umaru Musa Yardua University, Katsina State and the TetFund Nigeria for research scholarship.

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Authors and Affiliations

  1. School of Physics, Universiti Sains Malaysia (USM), 11800, George Town, Penang, Malaysia

    Abdulkarim Hamza El-ladan & Shanmugan Subramani

  2. Center for Renewable Energy and Research, Umaru Musa Yaradua University, Katsina, Nigeria

    Abdulkarim Hamza El-ladan

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  1. Abdulkarim Hamza El-ladan
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Correspondence to Shanmugan Subramani.

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El-ladan, A.H., Subramani, S. Influence of composition ratio on the thermal performance of AlNB nanocomposite for an efficient heat spreading in solid-state lighting package (LED). J Mater Sci: Mater Electron 33, 2183–2191 (2022). https://doi.org/10.1007/s10854-021-07425-w

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