Research And Application For OLED Of Ln³⁺-containing Metallopolymer Or Ir（Ⅲ）-complex Modified With BF₃

With the development of organic light-emitting diodes（OLED）technology,new organic fluorescent dyes were attracting widespread attention.Among them,BF₃-modified fluorescent dyes were much concerned due to their relatively low cost and good luminescent properties.In term of the color-tunning and the design of new organic fluorescent dyes,this thesis focused on the effect of BF₃-modification for the formation of white-emitting Ln³⁺-containing metallopolymers,and the fabrication of OLED from the BF₃-modified Ir（Ⅲ）-complex.The main content is as follows.Firstly,the schiff base Hass（2-（（4-vinylphenylimino）methyl）phenol）from the reaction of 4-vinylbenzenamine and salicylaldehyde and its BF₃-modified complex BF₂-ass were obtained,respectively.Their photophysical properties showed yellow-light and cyan-light,respectively.Moreover,through the covalently-bonding of Hass,BF₂-ass and lanthanide complex monomer[Eu（tta）₃4VPBI]（Htta=2-Thenoyltrifluoroacetone:4VPBI=1-（4-vinylbenzyl）-2-（pyridin-2-yl）-1H-benzo[d]imidazole）into PMMA（poly（methyl methacrylate））,theLn³⁺-containingmetallopolymer Poly（Hass-co-BHass-co-[Eu（tta）₃4VPBI]-co-MMA）（300:1:[Hass:BHass:[Eu（tta）₃4VPBI]=1:1:1]）with direct white-light（CIE x=0.307,y=0.247:CCT=8722 K:CRI=54）was realized.Furthermore,based on the change of the feed ratio（Hass:BF₂-ass:[Eu（tta）₃4VPBI]=1:0.5:1）,the corresponding white-light parameters（CIE x=0.377,y=0.387:CCT=4150 K:CRI=92）were siginicantly improved.Secondly,usingtheiridium（Ⅲ）complex[Ir（iqbt）₂hpa]（Hiqbt=1-（benzo[b]thiophen-2-yl）isoquinoline:H₂pa=3-hydroxypicolinic acid）as the precursor,the BF₃-modified Ir（Ⅲ）-complex[Ir（iqbt）₂BF₂-pa]was obtained.Both of them emitted deep-red light in solution.For[Ir（iqbt）₂hpa],the lifetime is 0.270μs(l_em=690 nm),and the fluorescence quantum yield is 0.022%.As to[Ir（iqbt）₂BF₂-pa],the lifetime is 0.294μs(l_em=680 nm),and the fluorescence quantum yield is0.021%.Finally,OLED devices Ⅰ-Ⅱ based on[Ir（iqbt）₂hpa]（sample 1）and[Ir（iqbt）₂BF₂-pa]（sample 2）were fabricated,respectively.For OLED device I,the EQE is 0.35%and the brightness is 1.19 cd/m².For OLED device II,the EQE is 0.08%and the brightness is 1.6 cd/m².In order to further improve the performence of the two devices,TmPyPB（1,3,5-tri[（3-pyridyl）-phen-3-yl]benzene）was added as the electron transfer layer,where the significantly improved performances（the EQE of 0.8%and the brightness of 80 cd/m² for OLED I;the EQE of 0.25%and the brightness of 3.5cd/m²）were exhibited.