Abstract
本發明提出一種可發射近白光寬頻光譜之高分子發光二極體，其包括一透明電極(正極)，一金屬電極(負極)，一有機發光層，及一添加的電洞傳遞層及/或電子傳遞層。其中該有機發光層包括可發藍綠光的聚對位苯基乙烯(Poly(phenylene vinylene)，PPV)共聚合體和發紅光的PPV烷氧基取代衍生物之摻合物，其在兩者的適當比例之下發出的光色近似於太陽光的黃白光，其電激發光譜寬廣，涵蓋了可見光範圍，且不隨電壓之增加而改變。且其中亦藉著加入一層電洞傳遞層及一層電子傳遞層來降低元件的起始電壓及增加發光效率。此外，本發明也提出製備該高分子發光二極體的方法，其包括將上述二種可發光之共軛高分子分別溶在有機溶劑中，以發藍光色系高分子對發紅光色系高分子的重量比為150:1~10:1之比例摻合成均勻溶液，將該溶液塗佈在電極基材(當正極)上，經乾燥得一均勻的膜，然後在高真空下鍍上另一電極(當負極）。
The present invention discloses a high polymer light emitting diode capable of emitting nearly white light broadband spectrum, which comprises: a transparent electrode (anode), a metal electrode (cathode), an organic light emitting layer, and an additive electric hole transmitting layer and/or electron transmitting layer, wherein the organic light emitting layer comprises the adulterant composed of the copolymer of poly(phenylene vinylene), PPV, capable of emitting blue-green light and the derivative with PPV alkoxyl substitute capable of emitting red light that the emitted light color is almost the yellow-white light of sunlight with appropriate ratio between the two. The electric-excited spectrum is broad and covers the visible light range and will not be changed by increasing the voltage. Furthermore, by adding a layer of electric hole transmitting layer and a layer of electron transmitting layer, the initial voltage of device is reduced and the light emitting efficiency is increased. In addition, the present invention also discloses the preparation method for the high polymer light emitting diode which includes: melting said two kinds of light-emitting conjugate high polymer in organic solvent and mixing the blue-light-emitting high polymer with red-light-emitting high polymer in a weight ratio of 150:1~10:1 to become an uniform solution; then, spraying the solution on electrode substrate (as anode) and achieving an uniform film after dehydration; and dipping another electrode (as cathode) in a highly vacuum environment.