LIGHT-EMITTING-DIODES MADE FROM CADMIUM SELENIDE NANOCRYSTALS AND A SEMICONDUCTING POLYMER
LIGHT-EMITTING-DIODES MADE FROM CADMIUM SELENIDE NANOCRYSTALS AND A SEMICONDUCTING POLYMER
复制标题
DOI：
10.1038/370354a0
复制
发表时间：
1994-08-04
期刊：
影响因子：
64.8
通讯作者：
ALIVISATOS, AP
中科院分区：
文献类型：
--
作者：
COLVIN, VL;SCHLAMP, MC;ALIVISATOS, AP
电致发光器件最近已经开发，其基于新材料，如多孔硅和半导体聚合物（2，3）。通过利用直接带隙半导体纳米晶体（4-6）和电致发光聚合物的制备和表征的发展，我们现在已经构建了混合有机/无机电致发光器件。光发射由注入半导体对亚苯基亚乙烯基（PPV）（8-10）层中的空穴与注入硒化镉纳米晶体多层膜中的电子的复合引起。纳米晶体的发射层与金属接触的功函数的紧密匹配导致仅4V的操作电压（11）。在低电压下，发生来自CdSe层的发射。由于量子尺寸效应（19-24），这种发射的颜色可以通过改变量子尺寸而从红色变为黄色。在较高电压下，来自聚合物层的绿色发射占主导地位。因此，该器件具有一定程度的颜色电压可调谐性。
Electroluminescent devices have been developed recently that are based on new materials such as porous silicon and semiconducting polymers(2,3). By taking advantage of developments in the preparation and characterization of direct-gap semiconductor nanocrystals(4-6), and of electroluminescent polymers', we have now constructed a hybrid organic/inorganic electroluminescent device. Light emission arises from the recombination of holes injected into a layer of semiconducting p-paraphenylene vinylene (PPV)(8-10) with electrons injected into a multilayer film of cadmium selenide nanocrystals. Close matching of the emitting layer of nanocrystals with the work function of the metal contact leads to an operating voltage(11) of only 4 V. At low voltages emission from the CdSe layer occurs. Because of the quantum size effect(19-24) the colour of this emission can be varied from red to yellow by changing the nanocrystal size. At higher voltages green emission from the polymer layer predominates. Thus this device has a degree of voltage tunability of colour.