Solution-processed single-emissive-layer WOLEDs with high efficiency and ultra-high color rendering index beyond 90

Abstract

White organic light-emitting diodes (WOLEDs) have appealing applications in display technology. Developing WOLEDs based on cost-effective manufacturing processes is critical to the commercial pursuits of this technology. Solution-processed WOLEDs (SP-WOLEDs)...

High-efficiency all fluorescence white OLEDs with high color rendering index by manipulating excitons in co-host recombination layers

“…With the concentration of DBP as low as 0.5%, direct carrier recombination on the fluorescent molecules of DBP by the trapping effect can be effectively suppressed despite great energy differences between co-host and DBP. 38,39 The all fluorescence three-color WOLED structures are ITO/HAT-CN (5 nm)/TAPC (40 nm)/TCTA (10 nm)/CBP : PPF : t BuCzDBA (1 : 1, 10%, 4 nm)/CBP : PPF : DBP (1 : 1, 0.5%, 3 nm)/CBP : PPF : t BuCzDBA (1 : 1, 10%, x nm)/mCBP : PPF : DMAC-DPS (1 : 1, 20%, 6 nm)/PPF (10 nm)/PBPPhen (50 nm)/Liq (2 nm)/Al (100 nm), where x = 0, 3, 4.5 or 6 nm are referred to W5–W8, respectively. The yellow TADF layer between blue and red EMLs is the cascaded exciton transfer layer (CETL), which plays a critical role in exciton harvesting and manipulation.…”

Advances in Host-Free White Organic Light-Emitting Diodes Utilizing Thermally Activated Delayed Fluorescence: A Comprehensive Review

“…We listed four common types of TADF-WOLEDs, as shown in Figure 1 , and summarized the key data from their representative literature in Table 1 . Most research works concerning OLEDs are carried out based on doping and excitable compounds, but at the same time, there are problems such as complex device structure [ 34 , 35 ], strict doping ratio [ 36 , 37 ], and easy contamination during the evaporation process [ 38 ]. However, ultrathin WOLEDs (the luminous layer is usually a few nanometers or even less than 1nm of the device) can make it easier to conduct experiments by virtue of its simple device structure.…”