30results about How to "Lower concentration quenching" patented technology

The invention discloses a pyridazine iridium complex containing an alkyl steric hindrance group, a preparation method and an application thereof, and belongs to the field of organic photoelectric materials. The method solves the problems in the prior art that the preparation of the pyridazine tricyclometalated iridium complexes requires expensive raw materials or the raw materials have poor adaptability and the problem that the luminescence concentration of the iridium complexes is obviously quenched. The general structural formula of the pyridazine iridium complex containing an alkyl hindering group of the present invention is shown in formula (1), and the preparation method is: first synthesize a pyridazine ligand containing a bicycloalkyl group, and then synthesize the bicycloalkyl group The pyridazine ligand and IrCl 3 .(tht) 3 The reaction generates pyridazine tricyclic metallized iridium complexes, the concentration quenching of the obtained iridium complexes is significantly reduced, and the doping concentration of the organic electronic light-emitting device prepared thereby is greatly increased.

The invention discloses alkali metal bismuth gallate infrared optical glass a preparation method. The main components of the glass include Bi2O3, Ga2O3, La2O3 and R2O. The preparation method includes: firstly, powders of every component are mixed evenly, heated to be at 1000-1300 degree Celsius and kept for 2-5 hours; secondly, melt is poured in a mold and is cooled naturally; thirdly, a formed glass sample is annealed, kept for 20-30 hours under the temperature of 300-400 degree Celsius, and then cooled to be at room temperature. The obtained glass has wider infrared transmission characteristics, good thermal stability and larger refractive index. The transmission range can reach to 0.5-7 Mu m, and the difference Delta T between the crystallization temperature and the transition temperature can reach to 150 degree Celsius. The refractive index can reach to 2.4-2.5 according to different components. The invention is applied to the optical fields of infrared detection, optical communication, etc.

The invention discloses a heat-activated delayed fluorescent material capable of solution processing and a preparation method thereof. This type of molecular structure is composed of two parts, one part is a core with thermally activated delayed fluorescence properties, and the other part is a group with a high triplet energy level connected by an alkyl chain, and has a structure as shown in formula I, formula I, wherein , R 1 , R 2 At most one of them is hydrogen, and the rest are groups with high triplet energy levels linked by alkyl chains. The advantages of this new material: the steric hindrance effect of the peripheral branch chain can effectively reduce the concentration quenching of the triplet excitons and improve the performance of the light-emitting device; the introduction of the alkyl chain can effectively enhance the solubility and film-forming properties of the material. The results show that this kind of solution-processable heat-activated delayed fluorescent material has relatively large molecular weight and good film-forming performance, and is suitable for wet preparation of organic electroluminescent devices. And with the increase of peripheral branch chains, the performance of the device is greatly improved.