使用銀奈米顆粒提升發光二極體光萃取效率之研究

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使用銀奈米顆粒提升發光二極體光萃取效率之研究

Enhanced LED Light Extraction Efficiency Using Ag Nanoparticles

宗成聖 , Masters　　Advisor：武東星　　

繁體中文

表面電漿；外部量子效益；發光二極體；氮化鎵； Surface Plasmon ； External Quantum Efficiency ； LED ； GaN

Abstract │ Reference (55) │ Altmetrics

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As time goes by, the energy efficiency and economic benefit have become a famous issue. In this thesis, a surface-plasmon-enhanced LED was successfully fabricated by improving the external quantum efficiency via the increase of light extraction efficiency of the device. It was found that the light extraction efficiency of lateral conducting blue LED can be enhanced by using surface plasmon polariton（SPP）and localized surface plasmon（LSP）. With a silver nanoparticle layer deposited on p-GaN layer, a metallic thin film as the grating structure increases the out-coupling efficiency during the SPP excitation. Subsequently, electron-beam evaporated 200-nm-thick indium tin oxide（ITO） as an ohmic contact layer with rough surface was deposited on a silver nanoparticle layer using a thermal annealing process. With a comparison of the optical performance of the conventional LED without the silver nanoparticles, we confirm the superior performance of these surface-plasmon-enhanced LED. It exhibited over 1.1 times output power increase than that of the conventional LED at 350 mA and the good current-voltage characteristic as well as the conventional LED. Especially, the transmittance of silver nanoparticles on the glass substrates is higher than 80%, indicating that the increase in output power intensity is not due to the reflection of light by a silver nanoparticle layer.

Reference ( 55 ) 〈TOP〉

【1】 J. P. Kottmann, Olivier J. F. Martin, D. R. Smith,and S. Schultz, “Spectral response of plasmon resonant nanoparticles with a non-regular shape”, Opt. Express, vol.6, p. 213, 2000.
連結：
【2】 J. P.Kottmann,and Olivier J. F. Martin, “Plasmon resonant coupling in metallic nanowires”, Phys. Rev. B, vol.64, p. 235402, 2001.
連結：
【3】 W. C. Liu, and D. P. Tsai, Jpn. J.Appl, “Deformation and Plasmon Effects of Deformed AgOx-Type Super-Resolution Near-Field Structure”, Phys. Part 1, vol.42, p. 1031, 2003.
連結：
【4】 H. F. Ghaemi, TinekeThio, D. E. Grupp, T. W.Ebbesen, and H. J. Lezec, “Surface Plasmon Antenna with Gold Line and Space Grating for Enhanced Visible Light Detection by a SilicononInsulator Metal Oxide Semiconductor Photodiode”, Phys. Rev. B, vol.58, p. 6779, 1998.
連結：
【5】 D. E. Grupp, H. J. Lezec, T. W. Ebbesen, K. M. Pellerin, and T. Thio, “Enhanced transmission through subwavelength apertures”, Appl. Phys. Lett., vol. 77, p. 1569, 2000.
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