tailieunhanh - Báo cáo hóa học: " Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures | Cho et al. Nanoscale Research Letters 2011 6 578 http content 6 1 578 o Nanoscale Research Letters a SpringerOpen Journal NANO EXPRESS Open Access Improvement of photon extraction efficiency of GaN-based LED using micro and nano complex polymer structures 1 1 11 2 1 t Joong-Yeon Cho Kyeong-Jae Byeon Hyoungwon Park Jinseung Kim Hyeong-Seok Kim and Heon Lee 1 Abstract A micro- and nanoscale complex structure made of a high refractive index polymer n was formed on the ITO electrode layer of an edge-emitting type GaN blue light-emitting diode LED in order to improve the photon extraction efficiency by suppressing total internal reflection of photons. The nanoimprint lithography process was used to form the micro- and nanoscale complex structures using a polymer resin with dispersed TiO2 nanoparticles as an imprint resin. Plasma processing such as reactive ion etching was used to form the micro- and nano-scale complex structure thus plasma-induced damage to the LED device can be avoided. Due to the high refractive index polymeric micro- and nanostructure on the ITO layer the electroluminescence emission was increased up to 20 compared to an identical LED that was grown on a patterned sapphire substrate to improve photon extraction efficiency. Introduction High brightness GaN-based light-emitting diodes LEDs have been widely used for solid-state lighting sources due to their low power consumption long lifetime compact form factor and eco-friendly nature 1-3 . The internal quantum efficiency hmt of GaN-based LEDs has been drastically improved by the progress of GaN-based epitaxial growth and device fabrication technologies 4 5 . Accordingly many attempts have been made to maximize the external quantum efficiency photon extraction efficiency of LEDs. However much room remains for improvement of the external quantum efficiency. One of the biggest issues surrounding the current high brightness LEDs is their low light extraction efficiency hext .

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