8-羟基喹啉镧两亲性配合物LB膜的双层电致发光器件

以具有不同层数的两亲配合物二2-（N-十六烷基氨基甲酰基）-8-羟基喹啉]合镧La(HQ)2Cl]的LB膜为发光层，PBD为电子传输层，制备了双层结构的电致发光（EL）器件：ITO/LB膜/PBD/Al。器件产生黄绿色注入式发光。LB膜的层数和沉积压对器件的性能具有重要影响。在16V激发电压下，5，11和21层LB膜双层EL器件的电流密度分别为48，29和16.4mA/cm^2，启亮电压阀值为7.5，8.5和9.5V。器件的亮度随电流密度和驱动电压的增加而增加。在相同偏压下，21层LB膜EL器件的亮度大于5和11层LB膜的器件。在25mN/m沉积的LB膜制备的EL器件具有较高的亮度（1219cd/m^2）和击穿电压。初步讨论了造成这种影响的原因。

Bilayer Electrol uminescent Devices of Langmuir-Blodgett Fil ms of Amphiphilic Complex Derivated from 8-Hydroxyquinoline Lanthanum

Organic electroluminescent (EL) devices with a bilayer structure (ITO/LB film/PBD/Al) were fabricated with an Langmuir Blodgett (LB) film of amphiphilic complex bis N hexadecyl 8 hydroxy 2 quinoline carboxamide] lanthanumLa(HQ) 2Cl] as the emitting material. Excellent performance of the EL devices originates from the insertion of an electron transport layer between the electrode and the emitting layer. Greenish yellow EL emission with a luminance of about 1 219 cd/m 2 was observed with a low voltage drive(7.5 V). The number of the layers of LB films and the deposited surface pressure have a strong influence on the I V characteristics, EL intensity, as well as break down voltage of the EL devices. When the LB films were prepared at the surface pressure of 25 mN/m, the current density crossing this kind of diodes had stronger nonlinear I V characteristics and the organic EL device had a higher EL intensity than another device prepared at lower surface pressure(5 and 15 mN/m). At a lower surface pressure, there may be some point defects or pinholes in the LB film, in which the high tunnel current would increase exponentially with the field, leading to an increase in the current density crossing the EL device and a decrease in the recombination probability of electrons and holes at a higher voltage.