Research And Application For OLED Of Ln³⁺-containing Metallopolymer Or Ir???-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???-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???complex[Ir?iqbt?₂hpa]?Hiqbt=1-?benzo[b]thiophen-2-yl?isoquinoline:H₂pa=3-hydroxypicolinic acid?as the precursor,the BF₃-modified Ir???-complex[Ir?iqbt?₂BF₂-pa]was obtained.Both of them emitted deep-red light in solution.For[Ir?iqbt?₂hpa],the lifetime is 0.270?s(l_em=690 nm),and the fluorescence quantum yield is 0.022%.As to[Ir?iqbt?₂BF₂-pa],the lifetime is 0.294?s(l_em=680 nm),and the fluorescence quantum yield is0.021%.Finally,OLED devices ?-? 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.