We have developed high-brightness white organic light-emitting diodes (OLEDs), which contain a tandem structure with two white electroluminescent (EL) units featuring a doping system comprised by a blue light-emitting host material [1,3,5-tris(1-pyrenyl)benzene (TPB3)] and a red light-emitting guest material[4-(dicyanomethylene) -2-tert-butyl
-6-(1,1,7,7tetramethyljulolidyl-9-enyl)-4H-pyran(DCJTB)].In this study, we used Li doped[tris(8-hydroxyquinoline)aluminum (Alq3)] as the n-type connecting unit and MoO3 as the p-type connecting unit. We adjust the conceration of Li in the n-type connecting unit, try to find the best power efficiency.In the end,we find the 24% Li doped[tris(8-hydroxyquinoline)aluminum (Alq3)] as n-type connecting unit is the best conceration.A tandem device having the configuration ITO (140 nm)/NPB (65 nm)/ TPB3 (30 nm)¡GDCJTB (0.05%)/ Alq3(30 nm)/Alq3 (20 nm)¡GLi ( 24 %)/MoO3 (5 nm)/NPB (65 nm)/TPB3 (30 nm)¡GDCJTB (0.05%)/Alq3 (30 nm)/LiF (0.8 nm)/Al (200 nm) ,which exhibited a maximum luminance of 72100 cd/m2, a maximum power efficiency of 3.44 lm/W at 8V, a maximum external quantum efficiency of 4.72% at 20V.The Color Rendering Index(CRI) reached to 79,and the Commission Internationale DeL¡¦Eclairage chromaticity coordinates were (0.35, 0.35)at 26 V.We attribute the high-brightness of this system to the efficient white EL units and connenting layers.
| Identifer | oai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0818110-163807 |
| Date | 18 August 2010 |
| Creators | Lu, Kun-da |
| Contributors | Ping-tsung Huang, Mei-ying Chang, Chih-chien Lee, Yu-kai Han, Wen-Yao Huang, Shun-wei Liu |
| Publisher | NSYSU |
| Source Sets | NSYSU Electronic Thesis and Dissertation Archive |
| Language | Cholon |
| Detected Language | English |
| Type | text |
| Format | application/pdf |
| Source | http://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0818110-163807 |
| Rights | not_available, Copyright information available at source archive |
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