Ghate Minakshi, Dahule H K, Thejo Kalyani N, Dhoble S J
Department of Physics Shivaji Science College, Congress Nagar, Nagpur, India.
Department of Applied Physics, Laxminarayan Institute of Technology, Nagpur, India.
Luminescence. 2018 Mar;33(2):297-304. doi: 10.1002/bio.3413. Epub 2017 Oct 18.
A novel blue luminescent 6-chloro-2-(4-cynophenyl) substituted diphenyl quinoline (Cl-CN DPQ) organic phosphor has been synthesized by the acid-catalyzed Friedlander reaction and then characterized to confirm structural, optical and thermal properties. Structural properties of Cl-CN-DPQ were analyzed by Fourier transform infrared (FTIR), nuclear magnetic resonance (NMR) spectroscopy, X-ray diffraction technique (XRD) and scanning electron microscopy (SEM) and energy dispersive analysis of X-ray (EDAX) spectroscopy. FTIR spectra confirmed the presence of different functional groups and bond stretching. H-NMR and C-NMR confirmed the formation of an organic Cl-CN-DPQ compound. X-ray diffraction study provided its crystalline nature. The surface morphology of Cl-CN-DPQ was analyzed by SEM, while EDAX spectroscopy revealed the elemental analysis. Differential thermal analysis (TGA/DTA) disclosed its thermal stability up to 250°C. The optical properties of Cl-CN-DPQ were investigated by UV-vis absorption and photoluminescence (PL) measurements. Cl-CN-DPQ exhibits intense blue emission at 434 nm in a solid-state crystalline powder with CIE co-ordinates (0.157, 0.027), when excited at 373 nm. Cl-CN-DPQ shows remarkable Stokes shift in the range 14800-5100 cm , which is the characteristic feature of intense light emission. A narrow full width at half-maximum (FWHM) value of PL spectra in the range 42-48 nm was observed. Oscillator strength, energy band gap, quantum yield, and fluorescence energy yield were also examined using UV-vis absorption and photoluminescence spectra. These results prove its applications towards developing organic luminescence devices and displays, organic phosphor-based solar cells and displays, organic lasers, chemical sensors and many more.
通过酸催化的Friedlander反应合成了一种新型蓝色发光的6-氯-2-(4-氰基苯基)取代的二苯基喹啉(Cl-CN DPQ)有机磷光体，然后对其进行表征以确认其结构、光学和热性能。通过傅里叶变换红外(FTIR)、核磁共振(NMR)光谱、X射线衍射技术(XRD)、扫描电子显微镜(SEM)和X射线能量色散分析(EDAX)光谱对Cl-CN-DPQ的结构性能进行了分析。FTIR光谱证实了不同官能团的存在和键的拉伸。氢核磁共振(H-NMR)和碳核磁共振(C-NMR)证实了有机Cl-CN-DPQ化合物的形成。X射线衍射研究揭示了其晶体性质。通过SEM分析了Cl-CN-DPQ的表面形貌，而EDAX光谱则进行了元素分析。差示热分析(TGA/DTA)表明其热稳定性可达250°C。通过紫外可见吸收和光致发光(PL)测量研究了Cl-CN-DPQ的光学性能。当在373nm激发时，Cl-CN-DPQ在固态结晶粉末中于434nm处呈现强烈的蓝色发射，其CIE坐标为(0.157, 0.027)。Cl-CN-DPQ在14800-5100cm范围内显示出显著的斯托克斯位移，这是强光发射的特征。观察到PL光谱的半高宽(FWHM)值在42-48nm范围内较窄。还使用紫外可见吸收和光致发光光谱研究了振子强度、能带隙、量子产率和荧光能量产率。这些结果证明了其在开发有机发光器件和显示器、有机磷光体基太阳能电池和显示器、有机激光器、化学传感器等方面的应用。
