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- W2079130159 abstract "We designed and synthesized a series of spiro-configured bipolar hosts (CSC, DSD, TST, and NSN) comprising electron-transporting 4,5-diazafluorene and hole-transporting carbazole or diarylamine with thorough characterizations of their thermal, photophysical, electrochemical properties, and carrier mobilities. Time-of-flight (TOF) measurements and single-carrier devices revealed these compounds had good hole and electron mobilities (10−5 − 10−7 cm2 V−1 s−1) together with promising physical properties, rendering them good host materials for efficient electrophosphorescence. The green PhOLED with (PPy)2Ir(acac) as the emitter incorporating CSC as the host exhibited a remarkable high brightness of 260 000 cd m−2 at 2400 mA cm−2 (11 V) with the maximum external quantum efficiency (ηext) of 17.1%, the ηext remained as high as 15.4% under a high brightness of 10 000 cd m−2 at a low operating voltage of 5.1 V even without p–i–n device configuration. The NSN-based PhOLED with the red dopant Os(bpftz)2(PPhMe2)2 has a maximum brightness of 77 900 cd m−2 at 1100 mA cm−2 (10 V) with the maximum ηext of 19.5%. The ηext remained as high as 19.1% under a practical brightness of 1000 cd m−2 (4.6 V). These results suggest that the spiro-configured D–A hosts are well-suited for achieving highly efficient PhOLED with limited efficiencies roll-off." @default.
- W2079130159 created "2016-06-24" @default.
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- W2079130159 date "2012-01-01" @default.
- W2079130159 modified "2023-09-24" @default.
- W2079130159 title "Spiro-configured bipolar hosts incorporating 4,5-diazafluroene as the electron transport moiety for highly efficient red and green phosphorescent OLEDs" @default.
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- W2079130159 doi "https://doi.org/10.1039/c2jm30749a" @default.
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