The electroluminescence intensity of a dodecanethiol-functionalized silver (DT-Ag) NP/ CPB:Ir(mpidmb) 2 (acac) film was increased by about 2.23 times in comparison with that of a control device, CPB:Ir(mpidmb) 2 (acac), due to coupling between excitons of emissive layer and the localized surface plasmon resonance (LSPR) of DT-Ag NPs. The current efficiency of a device with a DT-Ag NPs layer at 100 cd cm À2 (42.3 cd A À1) was 17.0 cd A À1 higher than that of the control device (25.3 cd A À1).The increase in current efficiency in the case of DT-Ag NP-coated devices was strongly related to the energy transfer between radiated light generated from the CBP:Ir(mpidmb) 2 (acac) emissive layer and the LSPR excited by the DT-Ag NPs layer.

A series of efficient electroluminescent materials with dual carrier transport properties shows enhanced singlet exciton utilization (h s ) due to small singlet-triplet splitting (DE ST ). The strong orbital-coupling transitions of N-(4-naphthalen-4-yl)phenyl)-N-phenyl benzenamine (DDPB) exhibit deep blue emission at 435 nm (CIEy, 0.07) with an external quantum efficiency of 2.01%. The electroluminescent efficiencies of 2-). The blue emissive materials CDDPI and DBDPA are used as a host to construct green and red phosphorescent OLEDs: the green device based on CDDPI:Ir(ppy) 3 exhibits higher efficiencies (L -8812 cd m À2 ; h ex -19.0%; h c -27.5 cd A À1 ; h p -33.0 lm W À1 ) at 2.7 V and the red device based on CDDPI:Ir(MQ) 2 (acac) exhibits a maximum luminance of 39 661 cd m À2 with excellent EL efficiencies [h ex -19.2%; h c -27.9 cd A À1 ; h p -29.2 lm W À1 ; CIE (0.64, 0.34)] compared with those of the DBDPA:Ir(MQ) 2 (acac) based device [L -37 621 cd m À2 ; h ex -18.5%; h c -25.2 cd A À1 ; h p -25.8 lm W À1 ; CIE (0.64, 0.34)]. ; Tel: +91 9443940735 † Electronic supplementary information (ESI) available. See Scheme 1 Synthetic routes for BDBD, BDBPI, DDPB, DBDPA and CDDPI. 6660 | RSC Adv., 2019, 9, 6658-6680 This journal is

No abstract