Luminescence Properties of A New Kind of Rare Earth Complexes Tb(m-benzoicacid)3
LIU Jun-feng1，TENG Feng1*，XU Zheng1，HOU Yan-bing1，LI Yong2, XU Yi-zhuang2, WU Jin-guang2
1. Institute of Optoelectronics Technology, Beijing Jiaotong University Laboratory of Materials for Information Storage and Display, Beijing 100044，China 2. College of Chemistry and Molecular Engineering, State Key Laboratory of Rare Earth Materials Chemistry and Application, Peking University, Beijing 100871，China
Abstract：The luminescence properties of a new kind of rare earth complex Tb (m-benzoicacid)3 were studied. With the new complex as the dopant and PVK as the host, the film of the mixed system was made, from whose spectra the authors learned that a highly efficient energy transfer process exists. The energy transfer is related to the mass proportion, and the more the mass proportion of Tb in the doped system, the more the emission proportion, and at the same time the emission of PVK is relatively weak. When the mass proportion of Tb(m-benzoicacid)3： PVK is higher than 20%, the emission of Tb is stronger than that of PVK, and plays the main role, while the emission of PVK disappears. The authors used the PVK:Tb(m-benzoicacid)3 system as the emission layer and Alq as the electron-transfer layer, thus the device，whose structure is ITO/PVK:Tb(m-benzoicacid)3/Alq/LiF/Al was formed. From the spectrum of this device, the characteristic emission of Tb can be observed. At the bias voltage of 21 V, a brightness 311 cd·m-2 was achieved.
Key words：Rare earths complex;Electroluminescence;Energy transfer
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