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Blue emitting exciplex for yellow and white organic light‑emitting diodes

作     者:Kavya Rajeev C.K.Vipin Anjali K.Sajeev Atul Shukla Sarah K.M.McGregor Shih‑Chun Lo Ebinazar B.Namdas K.N.Narayanan Unni Kavya Rajeev;C.K.Vipin;Anjali K.Sajeev;Atul Shukla;Sarah K.M.McGregor;Shih-Chun Lo;Ebinazar B.Namdas;K.N.Narayanan Unni

作者机构:Centre for Sustainable Energy TechnologiesCSIR-National Institute for Interdisciplinary Science and TechnologyThiruvananthapuram 695019India Academy of Scientifc and Innovative Research(AcSIR)Ghaziabad 201002India Centre for Organic Photonics&ElectronicsThe University of QueenslandBrisbaneQLD 4072Australia School of Mathematics and PhysicsThe University of QueenslandBrisbaneQLD 4072Australia School of Chemistry and Molecular BiosciencesThe University of QueenslandBrisbaneQLD 4072Australia 

出 版 物:《Frontiers of Optoelectronics》 (光电子前沿(英文版))

年 卷 期:2023年第16卷第4期

页      面:191-203页

核心收录:

学科分类:0808[工学-电气工程] 08[工学] 0803[工学-光学工程] 

基  金:support by DST-SERB,Govt.of India(CRG/2020/003699) CKV and KNNU acknowledge support from DST-AISRF program of the Department of Science and Technology,Government of India(DST/INT/AUS/P-74/2017) support from Council of Scientifc and Industrial Research(CSIR),Government of India for the award of a research fellowship.AKS acknowledges support from DST-INSPIRE for the award of a research fellowship. 

主  题:Organic light-emitting diodes Dual functional exciplex Spacers Device design strategy Blue exciplex Yellow OLEDs White light emission 

摘      要:White organic light-emitting diodes(WOLEDs)have several desirable features,but their commercialization is hindered by the poor stability of blue light emitters and high production costs due to complicated device structures.Herein,we investigate a standard blue emitting hole transporting material(HTM)N,N -bis(naphthalen-1-yl)-N,N -bis(phenyl)benzidine(NPB)and its exciplex emission upon combining with a suitable electron transporting material(ETM),3-(biphenyl-4-yl)-5-(4-tert-butylphenyl)-4-phenyl-4H-1,2,4-triazole(TAZ).Blue and yellow OLEDs with simple device structures are developed by using a blend layer,NPB:TAZ,as a blue emitter as well as a host for yellow phosphorescent dopant iridium(III)bis(4-phenylthieno[3,2-c]pyridinato-N,C2 )acetylacetonate(PO-01).Strategic device design then exploits the ambipolar charge transport properties of tetracene as a spacer layer to connect these blue and yellow emitting units.The tetracene-linked device demonstrates more promising results compared to those using a conventional charge generation layer(CGL).Judicious choice of the spacer prevents exciton difusion from the blue emitter unit,yet facilitates charge carrier transport to the yellow emitter unit to enable additional exciplex formation.This complementary behavior of the spacer improves the blue emission properties concomitantly yielding reasonable yellow emission.The overall white light emission properties are enhanced,achieving CIE coordinates(0.36,0.39)and color temperature(4643 K)similar to daylight.Employing intermolecular exciplex emission in OLEDs simplifes the device architecture via its dual functionality as a host and as an emitter.

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