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The structure of rare earth complexes is composed of the central ions and ligands, which has strong coordination ability and appropriate triplet energy neutral ligands with rare earth ions coordination at the same time, will not only help improve the light and electroluminescent performance, also can improve the fluorescence emission intensity of rare earth complexes, volatile and stability, etc.According to the report, the rare earth europium complexes as one of the biggest problems of electric emission materials because of its carrier in mobility, especially electron mobility, low , is only part of the traditional LED inorganic material 0.01 0.1% , the effective ways to solve this problem is the introduction of appropriate neutral ligands in the complexes. In terms of neutral ligands, also can increase the rigid molecules come loose to reduce energy consumption and improve complexes fluorescent efficiency (photoluminescence quantum yields, PLQY).In addition, rigid ligand containing rare-earth luminescence materials of OLED can also reduce the accumulation and interactions between molecules, in turn, can reduce the concentration quenching and "T - T" go out and improve the external quantum efficiency of the device
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The rare earth complexes is made up of the central ions and ligands. while the rare earth ions mates the neutral ligand with strong coordination ability and suitable level of triplet ,It not only contributes to  improving the photoluminescence and electroluminescence performance£¬ but also the fluorescence emission intensity, volatility and stability of the lanthanide complexes. According to reports,at currently,one of the biggest barriers of Europium complexes' application to electroluminescent emission materials is cused by Relatively low carrier mobility( especially the electron mobility).Just equal to 0.01-0.1% of the traditional LED inorganic material. an effective way to solve this problem is to introduce a suitable neutral ligand to the complexes. as to neutral ligand,we can increase the rigidity of the molecule to reduce energy dissipation and to improve the photoluminescence quantum yields of ligand complexes. In addtion, OLED rare earth luminescent materials containing rigid ligands can also reduce the accumulation and interaction of molecules and thus can reduce the concentration quenching and "TT" extinguishment then improve the external quantum efficiency of the device.
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Rare earth complexes, whose structure  is composed by center cations and  ligand, have  strong coordination ability and appropriate
neutral  ligand with triplet state  level .
It not only may be helpful to improve the properties of photics and electroluminescence, but improve the  fluorescent emission intensity,
volatility and stability when the  neutral  ligand was coordinated with  rare earth ions.
According to the reports, the greatest current problem of rare earth europium complex used as electric emission materials was that the mobility(especially the electronic mobility)  of europium complex carriers were relatively low, only 0.01-0.1% of  traditional LED inorganic materials.  Introducing the neutral ligand into complexes was  an effective solution to the problem.
The photoluminescence quantum yields(PLQY) could be improved by increasing molecular rigidity to reduce energy dissipation in  neutral ligand field.Furthermore, OLED rare earth luminescent material with rigid ligand could decrease the accumulation and  interaction  between molecule to reduce concentration quenching, ¡°T-T¡±extinguish and to improve the external quantum efficiency of devices.
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The rare earth complexes is composed of the central ions and ligands. while the rare earth ions mates the neutral ligand with strong coordination ability and suitable level of triplet ,It not only contributes to  improving the photoluminescence and electroluminescence performance£¬ but also the fluorescence emission intensity, volatility and stability of the lanthanide complexes. At currently,one of the biggest barriers of Europium complexes' application to electroluminescent emission materials is cused by Relatively low carrier mobility( especially the electron mobility).Just equal to 0.01-0.1% of the traditional LED inorganic material,As shown in reports.an effective way to solve this problem is to introduce a suitable neutral ligand to the complexes. as to neutral ligand,we can increase the rigidity of the molecule to reduce energy dissipation and to improve the photoluminescence quantum yields of ligand complexes. In addtion, OLED rare earth luminescent materials containing rigid ligands can also reduce the accumulation and interaction of molecules and thus can reduce the concentration quenching and "TT" extinguishment then improve the external quantum efficiency of the device.
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