Two heteroleptic iridium complexes, (dmppy)₂Ir(tmd) and (dmppy)₂Ir(acac), which consist of phenylpyridin (ppy) as main ligand with dimethyl substituents on both the phenyl ring and the pyridine ring, and heptanedione (tmd) and acetyl acetonate (acac) as ancillary ligands were synthesized and characterized regarding their suitability as orange organic light-emitting diodes (OLEDs). The photoluminescence (PL) of (dmppy)₂Ir(tmd) and (dmppy)₂Ir(acac) produced orange emissions with maximum emission peaks at 577 and 570 nm, respectively. The highest occupied molecular orbital (HOMO) and lowest unoccupied molecular orbital energy (LUMO) levels of (dmppy)₂Ir(tmd) and (dmppy)₂Ir(acac) were −5.03/-2.83 and −5.02/-2.77 eV, respectively. An optimized non-halogenated solution-processed (dmppy)₂Ir(tmd) device showed a high current efficiency of 52.7 cd/A and exhibits an efficiency of 89% when compared to a vacuum-deposited device that showed 66.7 cd/A at 1000 cd/m².

两种杂铱铱配合物（dmppy）₂ Ir（tmd）和（dmppy）₂ Ir（acac），由苯基吡啶（ppy）作为主要配体，在苯环和吡啶环上均具有二甲基取代基和庚二酮（tmd） ）和乙酰丙酮酸酯（acac）作为辅助配体进行了合成，并就其作为橙色有机发光二极管（OLED）的适用性进行了表征。（dmppy）₂ Ir（tmd）和（dmppy）₂ Ir（acac）的光致发光（PL）产生橙色发射，其最大发射峰分别在577和570 nm处。（dmppy）₂ Ir（tmd）和（dmppy）₂的最高占据分子轨道（HOMO）和最低未占据分子轨道能量（LUMO）级别Ir（acac）分别为-5.03 / -2.83和-5.02 / -2.77 eV。经过优化的无卤溶液处理（dmppy）₂ Ir（tmd）器件显示出52.7 cd / A的高电流效率，与真空沉积的器件在1000下显示66.7 cd / A的效率相比，显示出89％的效率。 cd / m ²。