掺杂型有机电致发光器件

Organic Electroluminescent Device from Dopant

成功制备了可溶性电子型聚合物PPQ [poly (phenylquinoxaline) ]掺杂的可溶性空穴型聚合物PDDOPV[poly(2 ,5 bis (dodecyloxy) phenylenevinylene) ]的单层发光器件。与具有相同厚度的纯PDDOPV的单层器件相比 ,起亮电压从 4 .5V降低到 2 .6V ,在电压相同的条件下 ,掺杂的单层器件的电流和纯PDDOPV的单层器件在同一个数量级 ,但其亮度和发光效率均比未掺杂器件提高 1个数量级以上。结果表明 ,在可溶性空穴型聚合物中掺杂可溶性电子型聚合物是提高器件性能的有效方法。

In order to get electroluminescent devices incorporate high efficiency, easy fabrication and long-term physical stability, single layer electroluminescent devices based on soluble p-type polymer PDDOPV [poly (2,5-bis (dodecyloxy)-phenylenevinylene)] doped by n-type soluble polymer PPQ [poly (phenyl quinoxaline)] are successfully fabricated. Compared with single layer device of pure PDDOPV, the turn-on voltage of doped single layer devices drop from 4.5 V to 2.6 V, at the same applied voltage, the current is higher but still at the same order of magnitude, the brightness and luminescent efficiency are both enhanced more than one order of magnitude. At 10 V, the current, brightness and luminescent efficiency of devices of blends are 1.95,30.9 and 16 times of those of devices of pure PDDOPV respectively. The remarkable enhancement of doped devices is attributed to the reduction of injection barrier of minority carrier and enhancement of minority carrier injection caused by the doping PPQ in PDDOPV. This result demonstrates that it is an effective way to improve the device performance by doping n-type polymer in p-type polymer.