Study On The Preparation And Photoelectric Properties Of 8-Hydroxyquinoline Lithium Doped Microcrystals

With the development of organic semiconductor optoelectronic display,a higher requirements for the optoelectronic properties of organic semiconductor crystal materials are put forward.The preparation for binary/multivariate doped crystals organic semiconductor using the doping methods is one of the effective ways to improve the optoelectronic properties of organic semiconductor crystal materials.The two problems need to be solved in the field of organic semiconductor materials.One is that the electron transport capacity of electron transport materials is generally lower than the hole transmission capability of hole transport materials.Another one is that the luminescence quality of red phosphorescent materials is low.Therefore,it is of great significance to prepare red phosphorescent organic semiconductor crystal materials with high electron transport capacity and high luminous quality.In order to solve the above two problems,Liq/Alq₃ doped microcrystals were designed and prepared in this paper.Combining with the strong triplet emission ability of Ir(ppy)₃,high color purity red light material Liq/Ir(ppy)₃ doped microcrystals were obtained.Both kinds of doped crystal materials have strong electron transport ability.At the same time,it provides a reference for the construction of organic semiconductor electronic spin suppression excitation system.In this paper,we prepared Liq/Alq₃ doped microcrystalline by double quenching method.The effects of experimental parameters(heat treatment temperature,heat treatment time,doping ratio)on their morphology and luminescence were studied.The phase composition and photoelectric properties were analyzed under the optimal experimental parameters,and the effects of phase composition on photoelectric properties were discussed.The results showed that:the optimal Liq/Alq₃ doped microcrystals have excellent aggregate luminescence properties,and their luminescence peak is located at 500 nm,which is green fluorescence and has high luminescence intensity;The absolute quantum yield is16.34%;In terms of stimulus response luminescence,it can achieve acid chromic(yellow-green fluorescence,luminescence peak at about 530 nm)alkali-induced restoration,oxygen plasma treatment chromic(red phosphorescence,luminescence peak at about 680 nm)tetrahydrofuran fumigation restoration;Liq/Alq₃ doped microcrystals have strong electron transport capacity,which is about 2.9 times that of Alq₃,and 3.1 times that of Liq.In order to obtain high quality red light materials,Liq/Ir(ppy3) doped microcrystals were prepared by introducing strong triplet emitter Ir(ppy)₃.The effects of experimental parameters on their morphology and luminescence were also investigated.The phase composition and photoelectric properties of the microcrystals were discussed under the optimal experimental parameters,and the luminescence mechanism was analyzed.The results show that the Liq/Ir(ppy)₃doped microcrystals have adjustable luminescence performance and high color purity red luminescence performance.Under different excitation wavelengths and different doping ratios,the fluorescence color is different,achieving green,yellow,orange,red and other luminescence,respectively.When the incident light at 633nm is excited,the Liq/Ir(ppy)₃ doped microcrystals display red luminescence.The red luminescence corresponding to the peak at 678 nm possesses a high color purity,which is very close to the standard red coordinate,and has a display application prospect.The electron transport capacity of Liq/Ir(ppy)₃ doped microcrystals is about 1.5 times that of Liq/Alq₃ doped microcrystals,4.3 times that of Ir(ppy)₃ and 5.3 times that of Alq₃.