Abstract
This paper demonstrates the influence of temperature, exciton concentration, and electron transportation layers on the excimer emission of a novel deep-blue material: 4,4′-bis(4′′-triphenylsilyl) phenyl-1,1′-binaphthalene (SiBN), by studying the photoluminescence and electroluminescence spectra of SiBN-based film. We have further developed sunlight-like and warm-light white organic light-emitting diodes (WOLEDs) with high efficiency and wide-range spectra, using SiBN and bis(2-phenylbenzothiozolato-N,C2′)iridium(acetylacetonate) (bt2Ir(acac)) as the blue excimer and yellow materials, respectively. The resulting device exhibited an excellent spectra overlap ratio of 82.9 % with sunlight, while the device peak current efficiency, external quantum efficiency, and power efficiency were 18.5 cd/A, 6.34 %, and 11.68 lm/W, respectively, for sunlight-like WOLEDs.
Highlights
The developments of organic materials and advanced device structures in organic light-emitting devices (OLEDs) [1, 2] and especially white Organic light-emitting diode (OLED) (WOLEDs) [3, 4] have recently attracted much interest for their application in full-color display and generation energy efficient solid-state lighting [5, 6]
It is worth considering SiBN as a promising candidate for blue emissive material in order to fabricate sunlight-like White organic light-emitting diode (WOLED) with high efficiencies and wide-range spectra
Exciplex emission usually occurs at the interface between emissive layer and Hole transportation layer (HTL) or Electron transportation layer (ETL) as the excited emissive molecule interacting with the inhomogeneous ground-state molecule, while it has no relationship with the doping concentration
Summary
The developments of organic materials and advanced device structures in organic light-emitting devices (OLEDs) [1, 2] and especially white OLEDs (WOLEDs) [3, 4] have recently attracted much interest for their application in full-color display and generation energy efficient solid-state lighting [5, 6]. The photoluminescence (PL) spectra of SiBN showed a monomer emission at 415 nm and an excimer emission at 468 nm, which could fully cover the blue region, meeting the needs of a wide spectrum in WOLEDs. In addition, the high thermal stability of SiBN was demonstrated, showing a high glass transition temperature at 159.3 °C, which could contribute to the stability and eventual efficiencies of the whole device. The high thermal stability of SiBN was demonstrated, showing a high glass transition temperature at 159.3 °C, which could contribute to the stability and eventual efficiencies of the whole device As a result, it is worth considering SiBN as a promising candidate for blue emissive material in order to fabricate sunlight-like WOLED with high efficiencies and wide-range spectra
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