State Key Laboratory of Optoelectronic Materials and Technologies, School of Chemistry and Chemical Engineering, Sun Yat-sen University, Guangzhou, 510275, PR China.
Dalton Trans. 2010 Oct 14;39(38):8919-24. doi: 10.1039/c0dt00424c. Epub 2010 Aug 16.
A novel 2-positional linked carbazole based β-diketone with methoxyl in the 7-position (EMOCTFBD), and its europium(III) ternary complex Eu(EMOCTFBD)(3)phen were synthesized via a 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)(3)phen 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)(3)phen is an interesting red-emitting material excited by blue light, and therefore may be applied in many fields without UV radiation.
一种新型的 2-位联咔唑基β-二酮，7-位带有甲氧基（EMOCTFBD），及其铕（III）三元配合物 Eu(EMOCTFBD)(3)phen 通过巧妙设计的间接路线合成，其中 EMOCTFBD 是 1-(9-乙基-7-甲氧基-9H-咔唑-2-基）-4,4,4-三氟丁烷-1,3-二酮，phen 是 1,10-菲咯啉。Eu(EMOCTFBD)(3)phen 表现出高的热稳定性。咔唑环 7-位引入甲氧基显著增强了蓝色区域的激发带强度，该配合物在蓝光激发下呈现出强烈的红色发射。测量了最低三重态能量，并表明光致发光过程为配体敏化发光过程（天线效应）。通过将配合物荧光粉涂覆在约 460nm 发射的 InGaN 芯片上，制备了一个明亮的红色发光二极管。所有结果表明，Eu(EMOCTFBD)(3)phen 是一种有趣的蓝光激发的红色发光材料，因此可能在没有紫外辐射的许多领域得到应用。
