Red-emitting cationic iridium complexes, namely, [Ir(ppy)₂(Qtpi)]PF₆ (Complex 1) and [Ir(piq)₂(Qtpi)]PF₆ (Complex 2) were synthesized using the ancillary ligand 2-(quinolin-2-yl)-1-(p-tolyl)-1H-phenanthro[9,10-d]imidazole (Qtpi) and 2-phenylpyridine (Hppy) and 1-phenylisoquinoline (Hpiq) as cyclometalating ligands. In acetonitrile solution, Complex 1 emitted orange light, centered at 614 nm, whereas Complex 2 gave rise to orange-red emission centered at 603 and a shoulder peak at 630 nm. Extended π-conjugation on the phenylpyridine ligand in Complex 2 lowered the energy-gap, leading to a red-shift the emission compared to that of Complex 1. A light-emitting electrochemical cell (LEC) fabricated with Complex 1 emitted red light with an emission peak at 618 nm and Commission Internationale de L'Eclairage (CIE) coordinates of (0.59, 0.36), respectively, with corresponding values of 692 nm and (0.56, 0.28) for Complex 2. The LEC based on Complex 1 demonstrated superior performance, with a maximum luminance and current efficiency of 808 cd m⁻² and 0.73 cd A⁻¹, respectively.

使用辅助配体2合成了发出红色光的阳离子铱络合物，即[Ir（ppy）₂（Qtpi）] PF ₆（化合物1）和[Ir（piq）₂（Qtpi）] PF ₆（化合物2）。 （喹啉-2-基）-1-（对甲苯基）-1 H-菲咯[9,10- d]咪唑（Qtpi）和2-苯基吡啶（Hppy）和1-苯基异喹啉（Hpiq）作为环金属化配体。在乙腈溶液中，配合物1发出中心色为614 nm的橙色光，而配合物2发出中心色为603和630 nm的肩峰的橙红色发射。与配合物1相比，配合物2中苯基吡啶配体上的扩展π共轭降低了能隙，导致发射红移。用配合物1制备的发光电化学电池（LEC）发出红光，而配合物1则发出红光。发射峰在618 nm处，国际照明委员会（CIE）坐标分别为（0.59，0.36），复合物2的对应值为692 nm和（0.56，0.28）。基于复合物1的LEC表现出优异的性能，最大亮度和电流效率为808 cd m^-2和0.73 cd A ^-1。