N,S-Induced Electronic States of Carbon Nanodots Toward White Electroluminescence
| Autor: | Taehyung Lee, Tae-Woo Lee, Sungan Do, Woosung Kwon, Young-Hoon Kim, So Rang Kang, Shi-Woo Rhee |
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| Rok vydání: | 2015 |
| Předmět: |
Photoluminescence
Materials science Dopant business.industry Doping 02 engineering and technology Electronic structure Electroluminescence 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 0104 chemical sciences Electronic Optical and Magnetic Materials law.invention law Optoelectronics 0210 nano-technology business Absorption (electromagnetic radiation) Visible spectrum Light-emitting diode |
| Zdroj: | Advanced Optical Materials. 4:276-284 |
| ISSN: | 2195-1071 |
| Popis: | In this work, nitrogen and sulfur-doped carbon nanodots (CNDs) have been synthesized from ethylenediamine-N,N′-diacetic acid and 2,2′-(ethylenedithio)diacetic acid, respectively. The method used in this work features the use of “single” molecular precursors that contain both carbon and dopant atoms, which allows examining the effects of doping in a molecular level. The effects of doping on the electronic structure of CNDs could be examined by a series of spectroscopic measurements including UV–vis absorption and photoluminescence. It is found that doping gives rise to new light absorption and photoluminescence bands at around 500 nm. Finally, light-emitting diodes (LEDs) with the CNDs synthesized have been demonstrated to show that the electronic states induced by direct doping influence their electroluminescence. Such LEDs successfully exhibit broadband electroluminescence covering the visible light range from 500 to 700 nm, resulting in bright pure white light whose CIE (Commission Internationale d'Eclairage) coordinate is (0.2894, 0.3351). |
| Databáze: | OpenAIRE |
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