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机构地区:[1]北京大学物理学院人工微结构与介观物理国家重点实验室,北京100871
出 处:《红外与毫米波学报》2014年第1期31-35,共5页Journal of Infrared and Millimeter Waves
基 金:Supported by the National Natural Science Foundation of China(11174018);the National 863 Project(2012AA012203);National 973 Project(2013CB632105)
摘 要:自行设计了基于8-羟基喹啉铒(ErQ)为发射层(EMLs)和二硝酰胺铵(ADN)为蓝光主体材料的近红外有机发光二级管.器件的基本结构为(p-Si/NPB/EML/Bphen/Bphen:Cs2CO3/Sm/Au),设计并比较了三套不同发射层结构(ErQ/ADN为双层结构器件,(ErQ/ADN)×3为多层结构器件,ErQ:ADN为掺杂结构器件)的器件.三组器件在一定的偏压下,均可发出1.54μm的光,对应三价铒离子4I13/2→4I15/2的跃迁.其中,ADN:ErQ(1∶1)掺杂结构的近红外电致发光强度是ADN/ErQ双层结构中的三倍.此外,不同掺杂浓度的ADN:ErQ复合膜做了以下表征:吸收谱、光致发光谱和荧光寿命谱.实验结果证实了在近红外电致发光过程中存在从ADN主体分子到ErQ发射分子的高效率的能量转移.A near-infrared (NIR) organic light-emitting devices (OLEDs) was demonstrated with emissive layers (EMLs) based on erbium (111) tris (8-hydroxyquinoline) (ErQ) and the blue host material of 9,10-di-beta-naphthylanthraeene (ADN). The fundamental structure of the devices is (p-Si/NPB/EML/Bphen/Bphen: Cs2COs/Sm/Au), where three sets of EMLs (ErQ/ADN bilayer, (ErQ/ADN) ×3 mnhilayer, and ErQ: ADN doped layer) have been compared. In all the three structures, 1.54 μm eleetroluminescence was observed due to the 4113/2 -4I15/2 transitions of Er3+. Compared with the ADN/ErQ bilayer structure, the NIR eleetrol (EL) intensity is stronger by three times in the ADN: ErQ( 1:1 ) doped structure. The ADN: ErQ composite films with different doping levels were further characterized by the measurements of absorption, photol and photoluminescence decay time. The results indicate effective energy transfer from ADN host to emissive molecular ErQ in the NIR EL process.
关 键 词:近红外发光 有机发光二级管 8-羟基喹啉铒 ERBIUM (111) TRIS (8-hydroxyquinoline)
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