Bauri Jayanta, Choudhary Ram Bilash
Nanostructured Composite Materials Laboratory, Department of Physics, Indian Institute of Technology (Indian School of Mines), Dhanbad, 826004, India.
Phys Chem Chem Phys. 2023 Aug 23;25(33):22195-22210. doi: 10.1039/d3cp02637j.
Conjugated polymers such as polycarbazole (PCz) have captivated more attention than other carbazole-based derivatives due to their superior electrical and optical properties. Accordingly, we synthesized PCz/gCN nanocomposites the polymerization method using FeCl as the oxidative reagent. The synthesized nanocomposites were subjected to characterization techniques to examine their optical and electrical parameters and decide whether the materials were suitable as emissive materials. X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were carried out to ascertain the crystalline or amorphous nature, surface interactions, and functional groups present in them. The surface microstructural and topographical investigations were conducted using field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (HRTEM) techniques. Optical parameters, such as refractive index ∼2.06, optical absorbance, optical band energy ∼2.77 eV, and the photoluminescence emission range, were studied using UV-Visible and photoluminescence spectrometry. The theoretical relative emission quantum yield of ∼67.9% and 87.7% energy transfer from the donor to the acceptor ion the Förster energy transfer mechanism are illustrated by the PL data. The Förster energy transfer mechanism has been elaborated. The carrier mobility ∼32.03 m V S, sheet resistance ∼1.6977 × 10 Ω m, carrier density ∼11.96 × 10 cm and conductivity ∼5.90 × 10 S cm were computed using Hall effect measurements. The dielectric constant, dielectric loss, and IV characteristic curve were estimated by the LCR and Four-probe IV measurement methods. The high PL emission intensity, CIE coordinates in the blue emission region, and the CCT value indicate that it is a suitable emissive layer material for OLED applications.
诸如聚咔唑（PCz）之类的共轭聚合物因其优异的电学和光学性能而比其他基于咔唑的衍生物更受关注。因此，我们使用FeCl作为氧化试剂通过聚合方法合成了PCz/gCN纳米复合材料。对合成的纳米复合材料进行表征技术以检查其光学和电学参数，并确定这些材料是否适合作为发光材料。进行了X射线衍射（XRD）和傅里叶变换红外光谱（FTIR）以确定其晶体或非晶性质、表面相互作用以及其中存在的官能团。使用场发射扫描电子显微镜（FESEM）和透射电子显微镜（HRTEM）技术进行表面微观结构和形貌研究。使用紫外可见光谱和光致发光光谱研究了光学参数，如折射率约为2.06、光吸收率、光学带隙能量约为2.77 eV以及光致发光发射范围。PL数据表明了约67.9%的理论相对发射量子产率以及通过Förster能量转移机制从供体到受体离子的87.7%的能量转移。阐述了Förster能量转移机制。使用霍尔效应测量计算了载流子迁移率约为32.03 m V S、薄层电阻约为1.6977×10Ωm、载流子密度约为11.96×10 cm以及电导率约为5.90×10 S cm。通过LCR和四探针IV测量方法估计了介电常数、介电损耗和IV特性曲线。高PL发射强度、蓝色发射区域的CIE坐标以及CCT值表明它是用于OLED应用的合适发光层材料。
