A remarkable attention have been devoted to fabricate blue OLEDs, since it plays a vital role in the field of organic electronics particularly in full colour flat panel displays. Though, notable research outputs were emerged, it is still being a challenging task by the researchers to fulfil its essential criteria such as highly efficient, colour stable and long life-span materials. With the view to address the issues, herein we report an easy synthetic strategy under catalyst free condition for a single imidazole moiety, 2-(1, 4, 5-triphenyl-1H-imidazol-2-yl)phenol, (TSPI-1) with excellent emissive behavior and high thermal stability. OLED device utilizing TSPI-1 as an active layer with the configuration of ITO/PEDOT: PSS (40 nm) /TSPI-1 (60 nm)/ TPBi (30 nm) / LiF (1 nm)/Al (100 nm) displayed blue emission with the maximum brightness of 1.60 Cd/m², CIE coordinates (0.17, 0.18) and the turn on voltage of 3.77 V. The synthesized imidazole derivative, TSPI-1 was well characterized by FT-IR, UV–vis, photoluminescence (PL), ¹H & ¹³C NMR, TGA-DTA, mass spectrometry and cyclic voltammetric (CV) studies. The results revealed the existence of localized electron density through non-planar geometry, specifically in solid state, good decay time, better morphological stability, (T_g = 111.93 °C) and high decomposition temperature (T_d = 344 °C), therefore rendering it as a highly desirable material to fabricate OLED device under vacuum evaporation.

由于蓝色OLED在有机电子领域（尤其是在全彩色平板显示器中）起着至关重要的作用，因此已经特别关注制造蓝色OLED。尽管已经出现了引人注目的研究成果，但要满足其诸如高效，颜色稳定和使用寿命长的材料等基本标准，研究人员仍然是一项艰巨的任务。为了解决这些问题，我们在此报告了一种在无催化剂条件下简单合成单个咪唑基团2-（1，4，5-三苯基-1 H的方法）-咪唑-2-基）苯酚（TSPI-1）具有出色的发射性能和高热稳定性。使用TSPI-1作为有源层的ITO / PEDOT结构的OLED器件：显示PSS（40 nm）/ TSPI-1（60 nm）/ TPBi（30 nm）/ LiF（1 nm）/ Al（100 nm）蓝色发射，最大亮度为1.60 Cd / m ²，CIE坐标为（0.17，0.18），开启电压为3.77V。合成的咪唑衍生物TSPI-1具有很好的红外光谱，紫外可见，光致发光特性（PL），¹ H和¹³ C NMR，TGA-DTA，质谱和循环伏安（CV）研究。结果表明存在通过非平面几何形状的局部电子密度，特别是在固态，良好的衰减时间，更好的形态稳定性（T _g ＝ 111.93℃）和高分解温度（T _d  ＝ 344℃），因此使其成为在真空蒸发下制造OLED器件的非常理想的材料。