White OLEDs based on novel emissive materials such as Zn(HPB)2 and Zn(HPB)q
| Autor: | Dong-Eun Kim, Young-Soo Kwon, Yoon-Ki Jang, Burm-Jong Lee, Byung-Sang Kim, Oh-Kwan Kwon, Won-Sam Kim |
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| Rok vydání: | 2007 |
| Předmět: |
Chemistry
Metals and Alloys Analytical chemistry Mineralogy Surfaces and Interfaces Benzoxazole Backlight Surfaces Coatings and Films Electronic Optical and Magnetic Materials law.invention chemistry.chemical_compound PEDOT:PSS law Materials Chemistry OLED Thermal stability Light emission Cyclic voltammetry Light-emitting diode |
| Zdroj: | Thin Solid Films. 515:5075-5078 |
| ISSN: | 0040-6090 |
| Popis: | Organic light emitting diodes (OLEDs) show a lot of advantages for display purposes. Because OLEDs provide white light emission with high efficiency and stability, it is desirable to apply OLEDs as an illumination light source and backlight in LCD displays. We synthesized new emissive materials, namely [2-(2-hydroxyphenyl)benzoxazole] (Zn(HPB) 2 ) and [(2-(2-hydroxyphenyl)benzoxazole)(8-hydoxyquinoline)] (Zn(HPB)q), which have a low molecular compound and thermal stability. We studied white OLEDs using Zn(HPB) 2 and Zn(HPB)q. The fundamental structures of the white OLEDs were ITO/PEDOT:PSS (23 nm)/NPB (40 nm)/Zn(HPB) 2 (40 nm)/Zn(HPB)q (20, 30 or 40 nm)/Alq 3 (10 nm)/LiAl (120 nm). As a result, when the thickness of the Zn(HPB)q layer was 20 nm, white emission is achieved. We obtained a maximum luminance of 15325 cd/m 2 at a current density of 997 mA/cm 2 . The CIE (Commission International de l'Eclairage) coordinates are (0.28, 0.35) at an applied voltage of 9.75 V. |
| Databáze: | OpenAIRE |
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