1. A strong red-emitting carbazole based europium(iii) complex excited by blue light.
- Author
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He, P., Wang, H. H., Yan, H. G., Hu, W., Shi, J. X., and Gong, M. L.
- Subjects
CARBAZOLE ,EUROPIUM ,COMPLEX compounds ,PHOTOLUMINESCENCE ,ULTRAVIOLET radiation ,LIGHT emitting diodes ,ORGANIC chemistry - Abstract
A novel 2-positional linked carbazole based β-diketone with methoxyl in the 7-position (EMOCTFBD), and its europium(iii) ternary complex Eu(EMOCTFBD)3phen were synthesized viaa dexterously designed indirect routine, where EMOCTFBD was 1-(9-ethyl-7-methoxyl-9H-carbazol-2-yl)-4,4,4-trifluorobutane-1,3-dione and phen was 1,10-phenanthroline. Eu(EMOCTFBD)3phen shows high thermal stability. The introduction of a methoxyl in the 7-position of the carbazole ring remarkably enhanced the excitation band intensity in the blue region, and the complex exhibited intense red emission under blue-light excitation. The lowest triplet state energy was measured and suggests the photoluminescence process as a ligand-sensitized luminescence process (antenna effect). A bright red-emitting diode was fabricated by coating the complex phosphor onto a ∼460 nm-emitting InGaN chip. All the results indicate that Eu(EMOCTFBD)3phen is an interesting red-emitting material excited by blue light, and therefore may be applied in many fields without UV radiation. [ABSTRACT FROM AUTHOR]
- Published
- 2010
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