Solution Processed Red Phosphorescent Organic Light-Emitting Diodes with Green Phosphorescent Ir Sensitizer

Autor:	Seul Ong Kim, Eun Young Choi, Ji Hyun Seo, Hoe Min Kim, Seung Soo Yoon, Jong-Tae Je, Young Kwan Kim, Kum Hee Lee
Rok vydání:	2011
Předmět:	Materials science Dopant Doping chemistry.chemical_element General Chemistry Condensed Matter Physics Photochemistry chemistry OLED General Materials Science Quantum efficiency Iridium Luminous efficacy Phosphorescence Solution process
Zdroj:	Molecular Crystals and Liquid Crystals. 538:91-97
ISSN:	1563-5287 1542-1406
DOI:	10.1080/15421406.2011.563657
Popis:	We fabricated the organic light-emitting diodes (OLEDs) with sensitizer by solution process. The addition of sensitizer into the emission layer improved the device efficiency. 4,4′-N,N′-dicarbazole-biphenyl (CBP), bis(2-phenylquinoline)iridium(III) (acetylacetonate) [Ir(pq)2(acac)], tris(2-phenylpyridine)iridium [Ir(ppy)3] were used as host, red emitting dopant, and sensitizer, respectively. The sensitizer leads to the cascade energy transfer from the host into the red emitting dopant. The doping concentration of sensitizer was varied as 0∼20 wt% and optimized. As a result, the device with 5% Ir(ppy)3 shows the luminous efficiency, power efficiency, and quantum efficiency of 5.1 cd/A, 4.0 lm/W, and 3.0%, respectively. These efficiencies are about 3 times as high as that of device without sensitizer.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3df9d09064854694cfc6d17f5ba7d01a https://doi.org/10.1080/15421406.2011.563657 Zobrazit plný text záznamu