Influence of Molar Concentration: Sol-Gel Synthesized Magnesium Oxide Thin Films for High Power Light Emitting Diode Thermal Management

International Conference on Sustainable Energy and Green Technology 2018

能源学;生态环境科学

Idris, M.S.^1^2 ; Shanmugan, S.^1 ; Devarajan, M.^1 ; Maryam, W.^1

School of Physics, Universiti Sains Malaysia (USM) 11800, Pulau Pinang, Malaysia^1

Department of Physics, Federal College of Education, Kano, Nigeria^2

关键词: High power light emitting diodes;    Higher junction temperatures;    Operating currents;    Optical characterization;    Sol-gel technique;    Surface smoothness;    Temperature performance;    Thermal conductivity measurements;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/268/1/012118/pdf
DOI  :  10.1088/1755-1315/268/1/012118

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Sol-gel technique was used to synthesize 0.6 M and 0.8 M molar concentrations of magnesium oxide thin on aluminium substrate and enforced into heat spreader material in thermal management of lighting devices. X-ray diffraction analysis confirm the films to be polycrystalline cubic in nature with (200), (220) and (222) orientations. 20 layers from 0.8 M showed higher intensity from the X-ray analysis. Relative thermal conductivity measurement of 20 layers from 0.6 M showed a value of (26.3 W/mK) which appears to improve over other layers. At 700 mA operating current, 20 layers from 0.6 M showed higher junction temperature difference of 37.16 °C as well as higher thermal resistance difference of 5.9 K/W when compared to bare aluminium substrate. All coated films are within the accepted color correlated temperature safe operating range (