“…The blue phosphorescent OLEDs with the structure of ITO/PEDOT:PSS/TAPC(30 nm)/TCTA(4 nm)/mCP(5 nm)/FIrpic(0.3 nm)/TmPyPB(45 nm)/LiF/Al also obtained the high device performance with the maximum PE and EQE reaching 50.82 lm W −1 and 17.72%, respectively. In such a device, there are three radiative decaying processes involved, i.e., the prompt and delayed fluorescence processes of exciplex as well as the phosphorescence processes of UEML molecules, as shown in Figure 10 D. In addition, the competition of those processes contributes to the realization of final high EL performance ( Mu et al., 2019 ). Figure 10 Energy transfer, exciton decaying route, and EL spectra diagrams (A) Light emission process diagram for orange OLEDs with UEMLs inserted interface with exciplex formation; Reproduced with permission ( Qi et al., 2017b ), Copyright, Elsevier.…”
Section: Oleds With Uemls Inserted Into Nonluminous Materialsmentioning
confidence: 99%
“…Herein, FET, DET, and Phos are the abbreviations of Förster, Dexter energy transfer, and phosphorescence radiation, respectively. Reproduced with permission ( Mu et al., 2019 ), Copyright, Elsevier. …”
Section: Oleds With Uemls Inserted Into Nonluminous Materialsmentioning
confidence: 99%
“…In such a device, there are three radiative decaying processes involved, i.e., the prompt and delayed fluorescence processes of exciplex as well as the phosphorescence processes of UEML molecules, as shown in Figure 10D. In addition, the competition of those processes contributes to the realization of final high EL performance (Mu et al, 2019).…”
Section: Inserted Into Heterojunction Interface With Exciplex Formationmentioning
confidence: 99%
“…(2018b) TCTA/Bepp 2 /Ir(ppy) 2 (acac) 98.0 85.4 25.5 – Phosphorescent UEML inserted into heterojunction interface with exciplex formation Qi et al. (2017b) NPB/(tbt) 2 Ir(acac)/B3PYMPM 53.3 53.1 19.5 17,400 Mu et al. (2019) mCP/FIrpic/TmPyPB – 50.8 17.7 – Xu et al.…”
“…The blue phosphorescent OLEDs with the structure of ITO/PEDOT:PSS/TAPC(30 nm)/TCTA(4 nm)/mCP(5 nm)/FIrpic(0.3 nm)/TmPyPB(45 nm)/LiF/Al also obtained the high device performance with the maximum PE and EQE reaching 50.82 lm W −1 and 17.72%, respectively. In such a device, there are three radiative decaying processes involved, i.e., the prompt and delayed fluorescence processes of exciplex as well as the phosphorescence processes of UEML molecules, as shown in Figure 10 D. In addition, the competition of those processes contributes to the realization of final high EL performance ( Mu et al., 2019 ). Figure 10 Energy transfer, exciton decaying route, and EL spectra diagrams (A) Light emission process diagram for orange OLEDs with UEMLs inserted interface with exciplex formation; Reproduced with permission ( Qi et al., 2017b ), Copyright, Elsevier.…”
Section: Oleds With Uemls Inserted Into Nonluminous Materialsmentioning
confidence: 99%
“…Herein, FET, DET, and Phos are the abbreviations of Förster, Dexter energy transfer, and phosphorescence radiation, respectively. Reproduced with permission ( Mu et al., 2019 ), Copyright, Elsevier. …”
Section: Oleds With Uemls Inserted Into Nonluminous Materialsmentioning
confidence: 99%
“…In such a device, there are three radiative decaying processes involved, i.e., the prompt and delayed fluorescence processes of exciplex as well as the phosphorescence processes of UEML molecules, as shown in Figure 10D. In addition, the competition of those processes contributes to the realization of final high EL performance (Mu et al, 2019).…”
Section: Inserted Into Heterojunction Interface With Exciplex Formationmentioning
confidence: 99%
“…(2018b) TCTA/Bepp 2 /Ir(ppy) 2 (acac) 98.0 85.4 25.5 – Phosphorescent UEML inserted into heterojunction interface with exciplex formation Qi et al. (2017b) NPB/(tbt) 2 Ir(acac)/B3PYMPM 53.3 53.1 19.5 17,400 Mu et al. (2019) mCP/FIrpic/TmPyPB – 50.8 17.7 – Xu et al.…”
“…12,13 In order to meet the needs of highquality red and white OLEDs, it is essential to design an advantageous emission layer structure, which can achieve high exciton utilization for both singlet and triplet, as well as effective charge injection and transportation at low voltage. 14 Recently, the co-hosts of exciplex formed by an acceptor and a donor, instead of traditional hole or electron type single hosts, has been regarded as a promising candidate for using as a host on phosphorescent OLEDs due to its good charge balance and exciton utilization. [15][16][17][18][19][20] Furthermore, it has been demonstrated that exciplex host with small singlet-triplet energy difference (ΔE st ) can notably reduce the turn-on voltage and improve the power efficiency (PE) and external quantum efficiency (EQE) of the PhOLEDs.…”
The exciplex forming co-host is one of the most promising candidates for developing high-performance organic light-emitting devices (OLEDs) that can implement an internal quantum efficiency of 100%. In this work,...
Phosphorescent organic light‐emitting diodes (PhOLEDs) with ultrathin emissive layer (UEML) structure have great potential in solid‐state lighting and display applications due to their relatively simple fabrication process. In this paper, the effect of doped UEML architecture on the performance of orange PhOLEDs is systematically investigated and highly efficient and long‐lifetime devices with the doped UEML structures are successfully constructed. Through strategic exciton management, the probability of exciton recombination is significantly enhanced, while simultaneously that of exciton annihilation is greatly suppressed, along with excellent charge balance. The resulting orange PhOLEDs based on tris[2‐(2‐pyridyl) imidazole] gallium(III):bis (2‐phenylbenzothiazolato) (acetylacetonate) iridium as emitter exhibit a maximum current efficiency of 60.8 cd A−1, power efficiency of 65.8 lm W−1, and external quantum efficiency of 23.4%, respectively. In addition, the doped UEML architecture greatly extends the device operational stability with a nearly fourfold lifetime improvement (time to reduce to 50% of the initial luminance at 2300 cd m−2) over the conventional phosphorescent device with doped bulk emitting layer. This should be the best results reported so far for orange PhOLEDs, indicating the use of doped UEML structure displays great potential value in designing highly efficient and long‐lifetime PhOLEDs.
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.
