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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Chang, Yi-lu Wang, Suning Lu, Jia-sheng Lu, Zheng-hong Schoenmakers, Dylan Rao, Ying-li Kang, Youngjin |
| Description | Author Affiliation: Rao YL ( Department of Chemistry, Queen's University, Kingston, Ontario, K7L 3N6 Canada.) |
| Abstract | New phosphorescent $Pt^{II}$ compounds based on dimesitylboron $(BMes_{2})-functionalized$ 2-phenylpyridyl (ppy) N,C-chelate ligands and an acetylacetonato ancillary ligand have been achieved. We have found that $BMes_{2}$ substitution at the 4′-position of the phenyl ring can blue-shift the phosphorescent emission energy of the $Pt^{II}$ compound by approximately 50 nm, compared to the $5′-BMes_{2}$ substituted analogue, without substantial loss of luminescent quantum efficiencies. The emission color of the $4′-BMes_{2}$ substituted $Pt^{II}$ compound, Pt(Bppy)(acac) (1) can be further tuned by the introduction of a substituent group at the 3′-position of the phenyl ring. A methyl substituent red-shifts the emission energy of 1 by approximately 10 nm whereas a fluoro substituent blue-shifts the emission energy by about 6 nm. Using this strategy, three bright blue-green phosphorescent $Pt^{II}$ compounds 1, 2 and 3 with emission energy at 481, 492, and 475 nm and $Φ_{PL}=0.43,$ 0.26 and 0.25, respectively, have been achieved. In addition, we have examined the impact of $BMes_{2}$ substitution on 3,5-dipyridylbenzene (dpb) N,C,N-chelate $Pt^{II}$ compounds by synthesizing compound 4, Pt(Bdpb)Cl, which has a $BMes_{2}$ group at the 4′-position of the benzene ring. Compound 4 has a phosphorescent emission band at 485 nm and $Φ_{PL}=0.70.$ Highly efficient blue-green electroluminescent (EL) devices with a double-layer structure and compounds 1, 3 or 4 as the phosphorescent dopant have been fabricated. At $100 cd m^{−2}$ luminance, EL devices based on 1, 3 and 4 with an external quantum efficiency of 4.7, 6.5 and 13.4 %, respectively, have been achieved. |
| ISSN | 09476539 |
| e-ISSN | 15213765 |
| Journal | Chemistry - A European Journal |
| Issue Number | 36 |
| Volume Number | 18 |
| Language | English |
| Publisher | Wiley-VCH;ChemPubSoc Europe |
| Publisher Date | 2012-09-03 |
| Publisher Place | Germany |
| Access Restriction | Open |
| Subject Keyword | Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Catalysis |
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