有机半导体发光材料

1、1By Kangbin Lin Chemical Society Reviews, 2011, 40(7): 3467-3482.ContentsIntroductionMultiple emittersSingle molecular emittersConclution and outlook23OLED schematic drawingIntroductionCIE chromaticity coordinates (x, y)Colour Rendering Index (CRI)Correlated Colour Temperature (CCT)4. Luminous power

2、 efficiency (lmW-1)5. Luminous efficiency (cdA-1)6. Internal quantum efficiency7. External quantum efficiency8. Lifetime4IntroductionApproaches to white electroluminescence from organic/organometallic emitters.5IntroductionStacked layers emitting different colours10V (0.31, 0.41)17 cdA-1Same host co

3、mpoundHigh energy gap mCP and TAZ641.3 lmW-1Stacked layers emitting different colours7Anodecathode layer (ACL)11.2V (0.33, 0.31)10.5%15. 1V (0.33, 0.38)5.3%Multiple emitters mixed in a single layer8Blending polymersDoping small molecular emitters in a wide energy gap hostMEH-PPV : 528 wt% rangePhase

4、 segregated nanocrystalline PFOamorphous MEH-PPV domainsEmission colourvoltage14 V 3.7 cdA-1Multiple emitters mixed in a single layer9p Minimum intermolecular distancep Encapsulated into functionalized cyclodextrins (0.282, 0.336)0.39 cdA-1Multiple emitters mixed in a single layer10The host：charge t

5、ransport；blue emission. Second non emitting co-host polymer: PVK Hole mobility and Miscibility Microphase-separated6.2V (0.33, 0.33)12.5 cdA-120 wt% 2 wt% 0.5 wt% Direct charge recombinationLow concentrationHostguest energy transfer14 lmW-1Single molecular emitters11Simplified scheme No device aging

6、 Difficult molecular design and colour purity Lower efficiencySingle molecular emitters12ITO/PEDOT:PSS/light emitting layer/LiF/AlTerthiophene monomer coreAlternative terthiophene(0.31, 0.42)0.35%Cross-like excimer aggregateSingle molecular emitters13 Platinum complexsBlue monomer/Red excimerGood tr

7、ansport properties Concentration of the emitter1020 wt% Incandescent lamps(15%)Single molecular emitters14Monomers and ElectromersPL and EL spectra of TECEB filmSignificant differenceBlue emission peaked at 450 nmSinglet excitonsVoltage independent(0.298, 0.310)8V(0.304, 0.327)15VSingle molecular em

8、itters15Broad PL and EL emissionSingle organometallic complexeSingle molecular emitters16ITO/PEDOT:PSS/P1(120 nm)/Ca/AgBenzothiadiazole (BT)苯并噻二唑 Molar ratio2% BT and 1% NTI12.5 cdA-1Block polymersSingle molecular emitters170.005 molar ratio0.003 molar ratioAlkyl spacer2.0 lm/W-15.75 lmW-122.62 cdA-

9、1Single molecular emitters18 Bisindolylmaleimide (双吲哚马来酰亚胺)PolyfluorenePolycarbazole(聚咔唑)P5 maleimide molar ratio：2% (0.33, 0.33)P6 Better hole transporting EfficiencySingle molecular emitters19Supramolecular copolymer self assemblypi-conjugated oligomers(0.31, 0.45) 0.5 mol% red, 1.0 mol% green and

10、 98.5 mol% blueSingle molecular emitters20Molecular dyadEther linkageExcited-state intramolecular proton transferStoke shiftNo excimersConclution and outlookThe most important classes of organic and organometallic electroluminescent materials used to produce white light have been introduced in this tutorial review together with methods to combine emitters of different colours. It appears clear that research efforts focusing on new emitting molecular and polymeric compounds are at the heart of the progress