Double co-host emitter based top emitting white organic light emitting diodes with enhanced brightness and ef-ficiency

• 作者: Neha Jain Sujata Pandey Rajiv Kr.Singh O.P.Sinha
• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2021,（10）
• 所属期刊栏目: Devices
• 页码范围: 581-585
• 页数: 5页
• 语种: 英文
• DOI: 10.1007/s11801-021-0183-6

摘要

Novel and simplified bi-layer top-emitting white organic light emitting diodes(OLEDs)with dual co-host emitters have been simulated and analyzed.They consist of yellow-green emitting layer(EML)as electron transport layer(ETL)and blue EML as hole transport layer(HTL).Novelty of the device lies in simplification of tri-layer white OLED to a bi-layered device which is done by merging yellow-green EML with ETL and blue EML with HTL.The simulated devices show Commission Internationale de L'Eclairage(CIE)colour coordinates well within the emission range of white light.The results show that device A with 5,6,11,12-tetraphenylnaphthacene(rubrene)doped ETL has achieved the lowest luminance but longest excited state lifetime.Device D with tris-(8-hydroxyquinoline)aluminum:4-(dicyanomethylene)-2-t-butyle-6-(1,1,7,7-tetra-methyljulolidyl-9-enyl)4H-pyran(Alq3∶ DCJTB)as ETL which emits yellow light and 2,7-bis[N,N-bis(4-methoxy-phenyl)amino]-9,9-spirobifluorene(MS-TPD)∶ bis(2-methyl-8-quninolinato)-4-phenylphenolate alu-minium(BAlq)as HTL which is responsible for blue light emission is found to have best characteristics when compared to other simulated devices.It has a maximum luminance of 10 000 cd/m2 and current efficiency of 15.25 cd/A,respectively,and CIE coordinates are at(0.329,0.319).The device is found to be compatible to be used in solid state lighting applications because of the low driving voltage of the device.