A study of enhanced GaN light-emitting diodes’ effeciency by ZnO nanorods array coupling Ag nanoparticles localized surface plasmons resonance

• Main Authors: Shen, Wei-Chen, 沈韋辰
• Other Authors: Lee, YaJu
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/14951438551309460873

碩士 === 國立臺灣師範大學 === 光電科技研究所 === 103 === In this study, we use magnetron sputtering system to grow a 30 nm ZnO thin film on the surface of GaN-based light-emitting diodes (LEDs) as the seed layer. The ZnO nanorods arrays were then grown by hydrothermal method with 0.03 M (Zn(NO3)2．6H2O) and 0.03 M (CH2)6．N4 (hexamethylenetetrami- ne,HMTA) compounds in a solution at 110℃ for 1 hour duration. After that, we spin coated Ag nanoparticles into ZnO nanorods by 500 r.p.m / 40 sec and baked the sample in the box with vacuum for 10 mins. The primary function of Ag nanoparticles is to absorb the wave-guided light trapping in the LED device, which consequently increases the localized field via surface plasma resonance (SPR) effect. The photoexcitated electrons in Ag nanopartilces jump from ground state to excited states, followed by relaxation of the excited electrons, accompanied by radiative emission which further enhaces the light output power and the exteranl quantum efficiency of the LEDs.