Blue phosphorescent organic light-emitting diodes (PHOLEDs) were fabricated with tin oxide (SnOx) nano-particles (NPs) deposited at the ITO anode to improve their electrical and optical performances. SnOx NPs helped ITO to increase the work function enhancing hole injection capability. Charge balance of the device was achieved using p- and n-type mixed host materials in emissive layer and the devices’ luminance and maximum external quantum efficiency (EQE) increased about nearly 30%. Tuning the work function using solution processed NPs allows rapid optimization of device efficiency.
In this paper, multiple‐exciplexed white organic light‐emitting diodes (WOLEDs) with blue and yellow–green emitting layers (EMLs) to improve charge balance and efficiency roll‐off through exciton confinement are investigated. Several types of WOLEDs are fabricated a number of including exciplex generated by only host materials without fluorescent or phosphorescent dopant. Moreover, various multiple exciplex can control electrical behavior of holes and electrons in whole EML. The performance improvement by the insertion of multi‐EMLs is realized throughout enhancement of exciton confinement and the reduced exciton quenching in EML. Efficiency roll‐off was 40% improved comparing to WOLED without multi‐EMLs and also color rendering index was achieved higher than 70 at 1000 cd m−2 in WOLED with multi‐EMLs.
Blue phosphorescent organic light‐emitting diodes (PHOLEDs) are fabricated using n‐type and bipolar extra emission layer with structure of ITO/TAPC (700 Å)/mCP:FIrpic‐8% (250 Å)/mCP:x:FIrpic‐8% (50 Å, x: CDBP, TPBi, TmPyPB)/TPBi (300 Å)/LiF (20 Å)/Al (1200 Å). The electrical and optical characteristics of blue PHOLEDs with different extra emission layer (EEL) material located between EML and ETL such as current density, luminous efficiency, efficiency roll‐off, and EL spectra are observed and proven that the extra emission layer material trapped charge carrier. The blue PHOLED with TPBi EEL improved driving voltage, luminous efficiency, and efficiency roll‐off compared to reference blue PHOLED without EEL.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.