水溶性CdSe纳米晶的电致发光研究

Electroluminescence of CdSe Nanocrystals Synthesized by Aqueous Solution

本文采用简单的化学合成方法在水溶液中以巯基乙酸为稳定剂制备了硒化镉(CdSe)纳米晶。它的紫外可见吸收光谱和发射光谱证实了CdSe纳米晶是纳米尺度,并且量子限域效应明显。以CdSe纳米晶为主要的发光材料制备了两种多层结构的电致发光器件,并对它们的光致发光和电致发光特性进行了研究比较。发现在电致发光光谱中得到了强的CdSe纳米晶的电致发光,而在光致发光中发光很强的poly(N-vinylcarbazole)(PVK)在电致发光中它的发光却被抑制了,另外在电致发光光谱中出现了一个新的发光峰值,把它归因于CdSe/BCP界面处的电致发光激基复合物的发光。

Cadmium selenium （CdSe） nanocrystals in aqueous system upon addition of mercaptoacetic acid as a stabilizer were synthesized. The absorption spectra and photoluminescence （PL） spectra of CdSe in aqueous solution were measured to confirm that the CdSe was nanometer - scale crystals and quantum - confinement was apparent. An electrolumineseence （EL） devices were fabricated using a CdSe：PVK thin film as the emitting layer. PL and electroluminescence properties of the CdSe：PVK film were studied. Compared with PL spectra, the PVK emission was restrained and the CdSe QDs dominated the emission in EL spectra. It was interesting that a new emission peak was emerged in EL, which should be attributed to the electroplex of interface of CdSe/BCP.