Near-Infrared (NIR) polymer light-emitting diode (PLED) based on organo-Yb3+-complex-grafted poly(N-vinylcarbazole) (PVK)

• DOI: 10.1016/j.jlumin.2018.07.037
• Publication Date: 2018-07-25T16:57:38Z
• Authors: Baoning Li; Guorui Fu; Jiaqing Guan; Yani He; Lin Liu; Kaimeng Zhang; Jiahao Guo; Weixu Feng; Xingqiang Lü
• Keywords: 02 engineering and technology; 0210 nano-technology

Abstract Through free-radical copolymerization of the Yb3+-centered near-infrared (NIR) luminescent complex monomer [Zn(L1)(4-vinyl-Py)Yb(L2)3] (2) (H2L1 = N,N’-bis(salicylidene)−1,2-diamine; 4-vinyl-Py = 4-vinyl-pyridine and HL2 = (Z)−3-methyl-1-phenyl-4-(2,2,2-trifluoro-1-hydroxyethylidene)−1H-pyrazol-5(4H)-one) with NVK (N-vinylcarbazole), the obtained [Zn(L1)(4-vinyl-Py)Yb(L2)3]-grafted polymer Poly(NVK-co-2) with additional PVK (Poly(N-vinylcarbazole)) to Yb3+ ion Foster energy transfer is used as the emitting material of polymer light-emitting diode (PLED), exhibiting the Yb3+-centered NIR outputs at 980 nm with a maximum efficiency of 0.049% (at 5.62 mA/cm2) and a maximum irradiance of 78.68 μW/cm2 (at 16 V), respectively. This superior performance to those of previously reported organo-Yb3+-doped polymer systems, together with the characters of low turn-on voltage of 7 V and weak efficiency-roll-off (0.049–0.031% upon 5.62–233.6 mA/cm2), indicates that organo-Yb3+-grafted polymer is an effective strategy to develop PLEDs with the wavelength extended to 980 nm.