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<p>Efficient thermal management is a critical bottleneck in the performance and reliability of high-power light-emitting diodes (LEDs) and advanced microelectronics. This study investigates the development of a scalable, solution-processed thin film heat spreader for LED thermal management based on Graphene Oxide (GO)-decorated Magnesium-doped Zinc Oxide (MZO) thin films. MZO films were synthesized on aluminum substrates via sol–gel spin coating, followed by systematic surface modification through 2, 4, 6, and 8 cycles of GO dip-coating. Structural analysis (XRD) confirms that moderate GO decoration promotes preferential c-axis orientation of the wurtzite ZnO lattice, while high-resolution microscopy (FESEM/AFM) reveals a morphological transition from discrete bridging networks to continuous agglomerated layers. We demonstrate a clear structure-property relationship where an optimal GO loading (2 cycles) minimizes surface roughness (24&#xa0;nm) and maximizes interfacial thermal coupling. This configuration achieves a superior heat extraction efficiency, reducing the steady-state LED junction temperature by approximately 3.5°C compared to bare aluminum substrates under 1.6&#xa0;W thermal load. Furthermore, optical characterization (UV-Vis/PL) indicates that the optimized hybrid film enhances UV absorption and suppresses defect-mediated recombination, suggesting dual functionality as both a heat spreader and an optoelectronic enhancer. These findings establish GO-decorated MZO as a promising, cost-effective candidate for passive thermal management in next-generation high-power electronics.</p>

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Graphene oxide decorated Mg doped ZnO thin film nanostructure for LED thermal management applications

  • 期刊论文

  • 发表日期：

    2026年5月11日

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  • Niamat Forazi Bappy,
  • Shanmugan Subramani

摘要

Efficient thermal management is a critical bottleneck in the performance and reliability of high-power light-emitting diodes (LEDs) and advanced microelectronics. This study investigates the development of a scalable, solution-processed thin film heat spreader for LED thermal management based on Graphene Oxide (GO)-decorated Magnesium-doped Zinc Oxide (MZO) thin films. MZO films were synthesized on aluminum substrates via sol–gel spin coating, followed by systematic surface modification through 2, 4, 6, and 8 cycles of GO dip-coating. Structural analysis (XRD) confirms that moderate GO decoration promotes preferential c-axis orientation of the wurtzite ZnO lattice, while high-resolution microscopy (FESEM/AFM) reveals a morphological transition from discrete bridging networks to continuous agglomerated layers. We demonstrate a clear structure-property relationship where an optimal GO loading (2 cycles) minimizes surface roughness (24 nm) and maximizes interfacial thermal coupling. This configuration achieves a superior heat extraction efficiency, reducing the steady-state LED junction temperature by approximately 3.5°C compared to bare aluminum substrates under 1.6 W thermal load. Furthermore, optical characterization (UV-Vis/PL) indicates that the optimized hybrid film enhances UV absorption and suppresses defect-mediated recombination, suggesting dual functionality as both a heat spreader and an optoelectronic enhancer. These findings establish GO-decorated MZO as a promising, cost-effective candidate for passive thermal management in next-generation high-power electronics.