A new terpyridine-based compound of 2,2′,7,7′-tetra([2,2':6′,2″-terpyridin]-4′-yl)-9,9′-spirobi[fluorene] (4oTPSF) was designed and synthesized as the electron transporter in organic light-emitting diodes (OLEDs). 4oTPSF exhibited excellent thermal stability with high glass transition temperature (T_g) of 250 °C and melting temperature (T_m) of 460 °C during the thermal measurement. The excellent thermal stability is attributed to the molecular structure, that the steric effect of rigid twisted spirobiflourene and the connected terpyridine (TPY) resulted in a decrease of the intermolecular π-stacking interaction. The studies on electrical characteristics of electron-only devices revealed that 4oTPSF showed high electron-transporting capability, as good as the conventional electron-transporting material (ETM) 1,3,5-tris(N-phenylbenzimid-azol-2-yl-benzene (TPBi). A series of green phosphorescent OLEDs (PhOLEDs) based on bis(2-phenylpyridine)iridium(III)(2,2,6,6-tetramethylheptane-3,5-diketonate) (Ir(ppy)₂tmd) or tris[2-(p-tolyl)pyridine]iridium(III) (Ir(mppy)₃) as emitter and 4oTPSF as ETM displayed a turn-on voltage of 2.23 V and a maximum power efficiency of 97.8 l m/W and a half-life (T₅₀) of 101, 5680 and 319 390 h at an initial luminance of 10 000, 1000 and 100 cd/m², respectively. The lifetime of 4oTPSF-based device was twice more than the lifetime of TPBi-based device.

2,2'，7,7'-tetra（[2,2'：6'，2''-terpyridin] -4'-yl）-9,9'-spirbibi [芴]（设计并合成了4oTPSF）作为有机发光二极管（OLED）中的电子转运体。4oTPSF在250°C的高玻璃化转变温度（T _g）和熔融温度（T _m）在460°C的温度下进行热测量。优异的热稳定性归因于分子结构，即刚性扭曲的螺双氟芴和连接的联吡啶（TPY）的空间效应导致了分子间π堆积相互作用的减少。对纯电子器件的电特性的研究表明，4oTPSF具有很高的电子传输能力，与常规的电子传输材料（ETM）1,3,5-三（N-苯基苯并咪唑-唑-2-基-苯（TPBi）。基于双（2-苯基吡啶）铱（III）（2,2,6,6-四甲基庚烷-3,5-二酮酸酯）（Ir（ppy）₂ tmd的一系列绿色磷光OLED（PhOLED））或三[2-（对甲苯基）吡啶]铱（III）（Ir（mppy）₃）（发射器）和4oTPSF（作为ETM ）在初始亮度为10000时显示的开启电压为2.23 V，最大功率效率为97.8 l m / W，半衰期（T ₅₀）为101、5680和319390 h分别为1000和100 cd / m ²。基于4oTPSF的设备的寿命是基于TPBi的设备的两倍。