White Light Emitting Films from Eu(III) Complexed Copolymers of Alternating Fluorene and Bis(pyrazolyl)pyridine Derivatives
White Light Emitting Films from Eu(III) Complexed Copolymers of Alternating Fluorene and Bis(pyrazolyl)pyridine Derivatives
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DOI：
10.1021/ma302296z
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发表时间：
2013-01-22
期刊：
影响因子：
5.5
通讯作者：
Chandrasekar, Rajadurai
中科院分区：
文献类型：
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作者：
Basak, Supratim;Narayana, Yemineni S. L. V.;Chandrasekar, Rajadurai
成功地合成了4-乙炔基-2，6-二(吡唑基)吡啶(BPP)端基荧烯(FO)Homo(P1)和FO-BPP主链共聚物(P2和P3)，M-n约为10 kDa。P1-P3共聚物的光学带隙分别为2.69、2.88和2.90 eV。旋涂P2和P3薄膜在紫外光照射下表现出蓝色和绿色的双发射，产生混合的青色光。利用主链三齿BPP单元的金属配位能力，通过浸渍镀膜技术在P2和P3薄膜的顶部形成了一层红色的Eu(III)离子配位共轭聚合物[FO-(BPP(Eu(Tta)(3))](N)层，实现了P2和P3的三重发光，最大发射波长分别为425,543,614 nm和428,543,611 nm。由P2和P3制备的白色发光薄膜的CIE(国际L委员会)坐标分别为(0.31，0.35)和(0.31，0.32)。这些值非常接近完美白光发射的指定坐标(x=0.33；y=0.33)。
4-Ethynyl-2,6-bis(pyrazolyl)pyridine (BPP) end-capped fluorene (FO) homo (P1) and FO-BPP main chain copolymers (P2 and P3) with M-n around 10 kDa were successfully prepared. The optical band gap of P1-P3 copolymers were 2.69, 2.88, and 2.90 eV, respectively. Spin-coated P2 and P3 thin films displayed blue and green dual emissions giving a mixed cyan color light under UV irradiation. By exploiting the metal coordinating ability of main chain tridentate BPP units, a red emitting Eu(III) ion coordinated conjugated polymer [FO-(BPP(Eu(tta)(3)))](n) layer was formed on top of the P2 and P3 thin films via the dip-coating technique to achieve white color radiant films displaying triple emission with maxima at 425, 543, 614 nm and 428, 543, 611 nm for P2 and P3, respectively. The CIE (Commission internationale de l'Eclairage) coordinates were found to be (0.31, 0.35) and (0.31, 0.32) for white emitting films made from P2 and P3, respectively. These values are very close to the designated coordinates for a perfect white light emission (x = 0.33; y = 0.33).