Thermal and optical properties of red luminescent glass forming symmetric and non symmetric styryl-4H-pyran-4-ylidene fragment containing derivatives
| Autor: | Valdis Kokars, Saulius Jursenas, Elmars Zarins, Aivars Vembris, Janis Jubels, Inta Muzikante, Arunas Miasojedovas |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Dye laser
Photoluminescence Chemistry Organic Chemistry Photochemistry Fluorescence Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Amorphous solid Inorganic Chemistry chemistry.chemical_compound Pyran Electrical and Electronic Engineering Physical and Theoretical Chemistry Glass transition Luminescence Spectroscopy Dichloromethane |
| Zdroj: | Optical Materials. 34:1501-1506 |
| ISSN: | 0925-3467 |
| Popis: | Dyes with amorphous structure deposited from organic solvents and having good fluorescence properties show potential for photonic device applications. Organic glass-forming symmetric and non symmetric styryl- derivatives of 2(2,6-substituted-4H-pyran-4-ylidene)-malononitrile (it has backbone of known laser dye 4-(dicyanomethylene)-2-methyl-6-[p-(dimethylamino)styryl]-4H-pyran), 2(2,6-substituted-4H-pyran-4-ylidene)-1H-indene-1,3(2H)-dione and 2(2,6-substituted-4H-pyran-4-ylidene)-pyrimidine-2,4,6(1H,3H,5H)-trione were synthesized and investigated. Glass transition temperatures higher than 110 °C were achieved. The absorption bands in dichloromethane solution cover the spectral region from 450 nm to 600 nm with fluorescence maxima between 580 nm and 690 nm. Photoluminescence quantum yields of the compounds in solution are between 0.3 and 0.54, which is reduced by one order in thin amorphous film prepared from volatile organic solvents. Incorporation of bulky trityloxyethyl groups in the derivatives results in significant reduction of aggregate formation. Thus fluorescence concentration quenching is reduced, enabling higher doping levels as compared to the unsubstituted 4-(dicyanomethylene)-2-methyl-6-[p-(dimethylamino)styryl]-4H-pyran dye. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect