The present invention is directed to matrix compounds and an organic light-emitting diode (OLED) comprising an emission layer and an electron transport layer stack of at least two electron transport layers, wherein a first electron transport layer and a second electron transport layer comprises at least one matrix compound, wherein the matrix compound or compounds of the first electron transport layer is/are different to the matrix compound or compounds of the second electron transport layer; and in addition, the first electron transport layer comprises a dopant of a lithium halide and/or lithium organic complex; and the second electron transport layer is free of a dopant; wherein at least one matrix compound of the second electron transport layer having the chemical formula Ia, Ib and/or Ic: (Ia) (Ib) (Ic) wherein Ar = substituted or unsubstituted arylene with 6 to 20 ring-forming carbon atoms; or carbazolylene; ET = substituted or unsubstituted aryl group with 13 to 40 ring-forming carbon atoms; or a substituted or unsubstituted heteroaryl group with 14 to 40 ring-forming atoms.
本发明涉及矩阵化合物和一种有发射层和至少两个电子传输层堆叠的有机发光二极管(OLED),其中第一电子传输层和第二电子传输层包含至少一种矩阵化合物,其中第一电子传输层的矩阵化合物与第二电子传输层的矩阵化合物不同;此外,第一电子传输层包含
锂卤化物和/或
锂有机络合物的掺杂剂;第二电子传输层不含有掺杂剂;其中第二电子传输层的至少一种矩阵化合物具有
化学式Ia、Ib和/或Ic:(Ia)(Ib)(Ic),其中Ar = 有6到20个环形碳原子的取代或未取代芳基;或羰基
芴基;ET = 有13到40个环形碳原子的取代或未取代芳基;或有14到40个环形原子的取代或未取代杂芳基。