%0 Journal Article
%T Magnetic field effects on organic electroluminescence<br>磁场对有机电致发光的影响
%A Wang Zhen
%A He Zheng-Hong
%A Tan Xing-Wen
%A Tao Min-Long
%A Li Guo-Qing
%A Xiong Zu-Hong
%A <br>王 振
%A 何正红
%A 谭兴文
%A 陶敏龙
%A 李国庆
%A 熊祖洪
%J 物理学报
%D 2007
%I 
%X A conventional organic light emitting diode, which has a structure of ITO/NPD/Alq_3/LiF/Al, was fabricated and the magnetic field effects(MFEs) on its electroluminescence(EL) were measured. We found that the MFEs of the organic EL is strongly dependent on the applied bias on the device while the photoluminescence from the Alq_3 film within the device is independent of the magnetic field. At low bias, the MFEs first rapidly increase with the magnetic field and then saturate at about 40kA/m, however at high bias the MFEs will decrease after this saturation, and the larger the bias, the stronger the decrease. The mutual annihilation of triplet-triplet pairs producing excited singlet excitons and the interaction between triplet excitons and excess carriers of Alq_3 anion or cation are the physical mechanisms of the phenomena observed in this study.
%K organic electroluminescence
%K magnetic field effects
%K exciton annihilation<br>有机发光
%K 磁场效应
%K 激子淬灭
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=6E709DC38FA1D09A4B578DD0906875B5B44D4D294832BB8E&cid=47EA7CFDDEBB28E0&jid=29DF2CB55EF687E7EFA80DFD4B978260&aid=1F73E0DF78C17AFC&yid=A732AF04DDA03BB3&vid=014B591DF029732F&iid=94C357A881DFC066&sid=4D7F1F234A77A0DC&eid=B129485A55867D93&journal_id=1000-3290&journal_name=物理学报&referenced_num=0&reference_num=27