研究了一种新的稀土配合物邻苯甲酰苯甲酸-1,10-菲咯啉-铕Eu(o-BBA)3(phen))的电致发光特性。采用不同的电子传输层材料,制备了多种结构的有机电致发光器件及有机无机复合器件。比较了单层电致发光器件A:ITO/PVK:Eu/Al与有机无机复合器件B;ITO/PVK:Eu/ZnS/Al发光性能的不同。分析了采用无机半导体材料ZnS作为电子传输层的优点。研究结果表明采用无机的电子传输层,能有效地避免激基复合物的形成,提高器件的亮度同时保持稀土离子发光的色纯性。
A novel rare earth complex of Eu ion with 2-benzoylbenzoic acid and 1,10-phenathrolinephen (Eu(o-BBA)3 (phen)) was synthesized and used as a dopant to fabricate efficient electrolumineseenee(EL) devices. It was doped into poly(N-vinylcarbazole) (PVK) and spin coated into films. Devices using organic layer Alq3 (or inserted hole blocking layer BCP) and inorganic layer ZnS as electron transporting layer respectively were fabricated. The luminescence properties of the single-layer decvice A (ITO/PVK : Eu/Al) and the organic-inorganic heterostructure device were analyzed. It was found that the device using ZnS as the electron transporting layer has higher brightness and lower threshold voltage while maintains pure emission.