2013
DOI: 10.1039/c3tc31357c
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A bipolar host containing carbazole/dibenzothiophene for efficient solution-processed blue and white phosphorescent OLEDs

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Cited by 50 publications
(20 citation statements)
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“…In recent years, dibenzofuran62 and dibenzothiophene63 have been explored as electron‐deficient or ‐withdrawing groups, as well as for the construction of bipolar host materials. The compounds CzDBF ( 26 ) and CzDBS ( 27 ) are typical examples.…”
Section: Solution‐processable Small‐molecular Host Materialsmentioning
confidence: 99%
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“…In recent years, dibenzofuran62 and dibenzothiophene63 have been explored as electron‐deficient or ‐withdrawing groups, as well as for the construction of bipolar host materials. The compounds CzDBF ( 26 ) and CzDBS ( 27 ) are typical examples.…”
Section: Solution‐processable Small‐molecular Host Materialsmentioning
confidence: 99%
“…An extremely high quantum efficiency of 23.9 % was obtained, which was better than any other data reported for solution‐processed blue phosphorescent organic light‐emitting diodes, and they owed this good data to the following three reasons: firstly, the low energy barrier for hole and electron injection favored the energy transfer process, in spite of electron trapping by the FIrPic dopant material; secondly, similar hole and electron current densities were observed for CzDBF, which enhanced the recombination efficiency of CzDBF devices; thirdly, the bipolar charge‐transport behavior of CzDBF balanced the hole and electron densities in the emitting layer, and broadened the recombination zone. In 2013, a novel small‐molecular host containing carbazole/dibenzothiophene (CzDBS, 27 ) was studied by the Lin group 63. Using this material, they fabricated the solution‐processed blue PhOLEDs with the architecture of ITO/PEDOT : PSS/CzDBS : FIrPic (10 wt%, 35 nm)/TmPyPB (60 nm)/CsF (1 nm)/Al.…”
Section: Solution‐processable Small‐molecular Host Materialsmentioning
confidence: 99%
“…31 Carbazole derivatives are established as hosts for PhOLEDs due to carbazole's high triplet energy and favorable hole-transporting properties. [32][33][34][35] The small-molecule mCP [1,3-bis(9-carbazolyl)benzene] which has a triplet energy of 2.9 eV is widely used in this context. [36][37][38][39][40][41] However, mCP tends to crystallize as a consequence of its rather low T g (glass transition temperature, 60 °C).…”
Section: Introductionmentioning
confidence: 99%
“…No carbazole derivative is absolutely electron-rich or deficient, which is strongly determined by the types of units and specific intermolecular linkage model because of "inductive" and "resonance" effects of different units, [63][64][65] and multifunctional hosts, which can be ambipolar, hole-blocking, or electron-transporting hosts, seem to be more power- ful for simplifying device structure and improving device performance. [66] As for organic electroluminescence, blue light is still lagging behind red and green lights in efficiency and stability.…”
Section: Discussionmentioning
confidence: 99%