於LED元件貼覆奈米光子晶體結構增益出光效率之研究

Improving Light Extraction of LED Devices by Attaching Nanostructures with Self-Assembled Photonic Crystal Patterns

鄒文傑(Wen-Chieh Tsou)

指導教授 ： 魏大華

國立臺北科技大學/機電學院/製造科技研究所/碩士(2014年)

https://doi.org/10.6841/NTUT.2014.00859

摘要

本研究是以旋轉塗佈(Spin Coating)法將不同尺寸之聚苯乙烯球(Polystrene, PS)於於光學級的聚碳酸酯(Polycarbonate, PC)塑膠膜上製備奈米光子晶體結構並貼覆於發光二極體(Light-Emitting Diode, LED)上以達到亮度增益的目的。本實驗所使用的發光二極體主要分為兩種不同封裝型態：一為壓模(Molding)型，是使用高碳鋼模具將環氧樹酯(EPOXY)射出成型；另一種為點膠(Encap)型，是使用針筒滴附於PPA塑殼中的方式製備。本實驗重點在於研究用於此兩種不同封裝的發光二極體元件貼覆聚碳酸酯膜後，因奈米光子晶體矩陣薄膜的粗糙化表面所造成的同調耦合光散射，改變封裝體內部的光全反射路徑，將困在發光元件內的光汲取出來，增強外部量子效益，進而提升元件的亮度，且於發光二極體貼覆光子晶體的增亮膜後，元件展現出發光角度變大且波長不變的優點。於壓模型發光二極體的測試結果，在三種波段的發光源下(紅光:630 nm; 綠光:523 nm; 藍光:465 nm)，皆有亮度增益的表現，並且當奈米球粒徑耦合發光源波長時,得到發光增益較佳,最高可到53.57%提升。

關鍵字

LED ； 奈米結構,發光效率 ； 奈米球微影術 ； 光子晶體 ； 外部量子效

並列摘要

This research work was aimed to increase the light extraction efficiency by using photonic nanocrystals film onto LED surface. The photonic nanocrystals film was composed of polystrene nanospheres by spin coating onto PC substrates, and then introduced it into two types of LED package. One LED package is molding type, and it is formed of epoxy injected by high carbon steel molding tooling. The other one is encap type, and it is formed of silicon by syringe dispense. The research work was focused on attaching the pc film onto LED surface with two types including molding and encap, respectively.
The roughening surface of photonic nanocrystals film resulted in coherent coupling light scattering and changed the path of light total reflection of internal LED package, thus effectively increased the external quantum efficiency due to extract the trapped photons in LED structure. The photonic nanocrystal films were with different sizes of nanospheres onto PC substrates by spin coating and used in molding type LED. The luminous intensity was increased in three light sources wavelength of R(630nm), G(523nm), and B(465nm), respectively. The best luminescence efficiency was occurred when the size of nanospheres was closed and coupled with the light source wavelength, and the improvement was up to 53.57%.

並列關鍵字

LED ； nanostructures ； luminous efficacy ； nanosphere lithography ； photonic

參考文獻

[5] 億光電子股份有限公司,http://www.everlight.com

[1] N. Holonyak, N. Holonyak, Jr. and S. F. Bevaqua, "Coherent(visible) Light Emission From GaAs1–xPx Junctions," Appl. Phys, Vol. 29, no.1, 1962, pp. 10-32.

[7] 彭凱鈺，銀奈米結構增益發光元件出光效率之研究，碩士論文，私立大同大

2005，第235頁。

[11] G. M. Whiteside and B. Grzybowski, "Self-Assembly at All Scales" Science,