Main types of photoluminescence rare earth organic complexes

In rare earth organic complexes, ligands should be able to effectively transfer excited state energy to neutral.
Heart ions, so the requirements for ligands are: good absorption intensity of ligands; The ligand Jintengye H-phase phenol-bearing, molecular macrocyclic, low-valent rare earth has a moderate life. According to the most widely used ligands at present, there are rare earth β diketones, organic carboxylic acids, supramolecular macrocycles and low-valent rare earths.
Four kinds of organic complexes.
(a) rare earth β diketone rare earth β diketone complex has high absorption coefficient from 9- diketone ligand to Eu+ and Tp+ plasma.
Efficiency transfer, thus having extremely high luminous efficiency. Is it from the study of ocular muscles? Work ability? Several R "ketones in L' Tangfan have a stable six-membered ring with rare earth ions, which directly absorbs excitation light and effectively transfers energy. Several common β diketones are thienyltrifluoroacetone.
(TTA), benzoyl trifluoroacetone (BTA), β-chaenoyl trifluoroacetone (F-NTA), 1,1,1- trifluoro -5- tert-butyl -2,4- dione (PTA), etc.
(b) Carboxylic acid ligands of such complexes mainly refer to carboxylic acids and amino acids containing aromatic rings, such as phthalic acid, benzoic acid and salicylic acid. This kind of carboxylic acid ligand has a large absorption coefficient in the ultraviolet region, and it is an important kind of rare earth ion luminescent sensitizer. At the same time, rare earth ions have strong coordination ability with organic carboxylic acids, and the complexes formed are relatively stable. Because carboxyl oxygen ions and metal ions can form a variety of coordination forms, such as chelating bidentate, bridge bidentate and monodentate, rare earth carboxylic acids have a variety of special structures, such as layered, infinite chain and network polymers. A deep study of the relationship between their spatial structure and luminescent properties can provide theoretical basis for the development of new organic-inorganic hybrid luminescent materials.
(c) Supramolecular Macrocycles Supramolecular macrocycles refer to the special ligand environment formed between the ligands of the complexes through electrostatic, hydrogen bonding, intermolecular forces and other actions, which constitute a special macromolecular structure. Hole-like supramolecular ligands of mace are the frontier of this kind of research. Luminescent mace supramolecules combine the advantages of excited state energy level transition of mace ions with the characteristics of wide absorption band and effective energy transfer of ligands, thus becoming an ideal luminous body. In recent years, it is the fastest and most fruitful field in the supramolecular research of luminous mace to construct a cavity-like mace complex containing several bipyridines [15]. In addition, supramolecular macrocyclic complexes can also produce polynuclear concentration effect with heteronuclear complexes and emit strong fluorescence [16].
(d) Low-valent rare earth organic complexes-Low-valent rare earth ions mainly refer to rare earth ions such as Eu'+, Ce3+ and Yb+ with f-d electronic transition characteristics. These low valence rare earth ions have a common feature, that is, their chemical stability is far less than the corresponding high valence, which brings great difficulties for studying the luminescent properties of these complexes. At present, the organic ligands of these complexes are mainly crown ethers or cryptand plasma carrier compounds, such as 15C5, 18C6, DC15C5 and .21 in cryptand.
At present, rare earth luminescent materials have been widely used in lighting, display and information, and become an indispensable part of human life.
Points. The improvement of the quality of rare earth luminescent materials and the development of application technology have promoted the research and production of a new generation of energy-saving light sources. Since the mid-1980s, with the successful development of cheap phosphors containing less graupel, the application of this energy-saving lamp has increased rapidly. T5 straight fluorescent lamp diameter is
The luminous efficiency of 16mm fluorescent lamp with power of 14~35W and 28W fluorescent lamp can reach 10lm/W, and its service life is more than 16000h. A compact energy-saving rare earth fluorescent tube with high power and strong light of 55~120W is newly developed in China, which is suitable for outdoor lighting, and its luminous efficiency is above 80 lm/w.. The lamp tube is characterized by coating rare earth tricolor fluorescent powder as luminous body, and adopting solid mercury to reduce secondary pollution and high-frequency electric lighting, which is one of the effective measures for green lighting, energy saving and environmental protection. After 30 years of research and development, China's rare earth luminescence and its materials science and technology and industrialization, although there is still a certain gap compared with developed countries, has achieved many independent scientific and technological achievements, and its production and application have promoted the development of related science and technology and industrialization, resulting in remarkable economic and social benefits.