有机半导体发光材料

1、1,Electroluminescent materials for white organic light emitting diodes,By Kangbin Lin,Chemical Society Reviews, 2011, 40(7): 3467-3482.,2,Contents,Introduction,Multiple emitters,Single molecular emitters,Conclution and outlook,3,OLED schematic drawing,Introduction,4,CIE chromaticity coordinates (x,

2、y) Colour Rendering Index (CRI) Correlated Colour Temperature (CCT) 4. Luminous power efficiency (lmW-1) 5. Luminous efficiency (cdA-1) 6. Internal quantum efficiency 7. External quantum efficiency 8. Lifetime,Introduction,5,Approaches to white electroluminescence from organic/organometallic emitter

3、s.,Introduction,6,Stacked layers emitting different colours,10V (0.31, 0.41) 17 cdA-1,Same host compound,High energy gap mCP and TAZ,41.3 lmW-1,7,Stacked layers emitting different colours,Anodecathode layer (ACL),11.2V (0.33, 0.31) 10.5%,15. 1V (0.33, 0.38) 5.3%,8,Multiple emitters mixed in a single

4、 layer,Blending polymers,Doping small molecular emitters in a wide energy gap host,MEH-PPV : 528 wt% range,Phase segregated nanocrystalline PFO amorphous MEH-PPV domains,Emission colourvoltage,14 V 3.7 cdA-1,9,Multiple emitters mixed in a single layer,Minimum intermolecular distance Encapsulated int

5、o functionalized cyclodextrins,(0.282, 0.336) 0.39 cdA-1,10,Multiple emitters mixed in a single layer,The host：charge transport；blue emission.,Second non emitting co-host polymer: PVK Hole mobility and Miscibility Microphase-separated,6.2V (0.33, 0.33) 12.5 cdA-1,20 wt% 2 wt% 0.5 wt%,Direct charge r

6、ecombination,Low concentration,Hostguest energy transfer,14 lmW-1,11,Single molecular emitters,Simplified scheme,No device aging Difficult molecular design and colour purity Lower efficiency,12,Single molecular emitters,ITO/PEDOT:PSS/light emitting layer/LiF/Al,Terthiophene monomer core Alternative

7、terthiophene,(0.31, 0.42) 0.35%,Cross-like excimer aggregate,13,Single molecular emitters,Platinum complexs Blue monomer/Red excimer Good transport properties Concentration of the emitter 1020 wt% Incandescent lamps(15%),14,Single molecular emitters,Monomers and Electromers,PL and EL spectra of TECE

8、B film,Significant difference,Blue emission peaked at 450 nm Singlet excitons,Voltage independent,(0.298, 0.310) 8V,(0.304, 0.327) 15V,15,Single molecular emitters,Broad PL and EL emission,Single organometallic complexe,16,Single molecular emitters,ITO/PEDOT:PSS/P1(120 nm)/Ca/Ag,Benzothiadiazole (BT

9、) 苯并噻二唑,Molar ratio 2% BT and 1% NTI,12.5 cdA-1,Block polymers,17,Single molecular emitters,0.005 molar ratio,0.003 molar ratio,Alkyl spacer,2.0 lm/W-1,5.75 lmW-1,22.62 cdA-1,18,Single molecular emitters,P5 maleimide molar ratio：2% (0.33, 0.33) P6 Better hole transporting Efficiency,19,Single molecu

10、lar emitters,Supramolecular copolymer self assembly,pi-conjugated oligomers,(0.31, 0.45) 0.5 mol% red, 1.0 mol% green and 98.5 mol% blue,20,Single molecular emitters,Molecular dyad,Ether linkage,Excited-state intramolecular proton transfer Stoke shift,No excimers,21,Conclution and outlook,The most i

11、mportant 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 of