利用PbS量子点波长转换膜实现近红外电致发光  

Near-infrared light-emitting devices using PbS quantum dots wavelength conversion film

作　　者：陈义鹏[1] 任志瑞[1] 李波[1] 张晓松[1] 徐建萍[1] 李岚[1] 

机构地区：[1]天津理工大学材料物理研究所显示材料与光电器件省部共建教育部重点实验室,天津300384

出　　处：《光电子．激光》2013年第11期2081-2085,共5页Journal of Optoelectronics·Laser

基　　金：国家自然科学基金(60977035;60907021);天津市自然科学基金(11JCYBJC00300);科技创新体系及条件平台建设计划(10SYSYJC28100)资助项目

摘　　要：采用聚合物poly（N-vinylcarbazole） （PVK）掺 杂小分子蓝色荧光材料 N,N′-bis（naphthalen-1-y）-N,N′-bis（phenyl） benzidine （NPB）作为蓝色发光层, 将PbS量子点与环氧树脂的混合 物涂覆在ITO导电玻璃背面作为波长转换膜,制备了结构为PbS QDs/Glass/ITO/PVK：NPB /Al的近红外波 长转换有机电致发光器件（OLED）。蓝色发光层中,NPB发出峰值位于445nm的蓝光。通过控制前驱体S/Pb比例调节PbS量 子点的粒径,正向电场下获得900～1600nm范 围可调节峰值的近红外光发射。经过优化波长转换膜中PbS量 子点比例,增强了波长转换膜对蓝光的吸收,当PbS量子点比例为10%左右时器件发射强 度最高。Novel near-infrared （NIR） light-emitting devices with a structure of PbS quantum dots （QDs）/glass/indium-tin oxide （ITO）/poly （N-vinylcarbazole） （PVK） ：N,N ′-bis（naphthalen-1-y）-N,N′-bis（phenyl） benzidine （NPB）/Al are fabricated. A hybrid system consisting of small molecular blue fluorescent material of NPB a nd polymer material of PVK is employed as the blue light emitting layer,and the near-infrared wavelength convers ion film is prepared by dispersing PbS quantum dots into the mixture of the A,B epoxy resin.The blue light emitti ng layer has a emission around 445nm,and the emission comes from the NPB.With various size of PbS quantum dots which were synthesized with different precursor molars of S/Pb,the EL spectrum shows tunable emission peaks at 900-1600nm in the near-infrared range under forward bias.The NIR emission intensity is improved by optimizing the ratio of PbS quantum dots in the wavelength conversion film.The increased ratio of PbS quant um dots can enhance the probability of blue light absorption.When the ratio reaches 10%,the emission int ensity tends to be the highest.

关 键 词：有机电致发光器件(OLED) 波长转换膜 PbS量子点 近红外光 

分 类 号：TN383[电子电信—物理电子学]