High-efficiency and deep-blue fluorescent organic light-emitting diodes with the easily controlled doping concentrations

Peng, Tai; Guo-fang, LI; Liu, Yu; Wu, Ying; Ye, Kaiqi; Yao, Dandan; Yang, Yuan; Hou, Zhaomin; Wang, Yue

doi:10.1016/j.orgel.2011.03.030

Cited by 22 publications

(9 citation statements)

References 37 publications

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“…With the continuous efforts from the concerned researchers, various kinds of blue fluorescent emitters based on fluorene, [12][13][14] carbazole, 15,16 anthracene, 17,18 styrylarylene, 19 pyrene, 20,21 triphenylene, 22,23 biphenyl 24 and quinoline 25 derivatives have been developed to fabricate efficient blue OLEDs. From the structural diversity of the blue fluorescent emitters and their encouraging EL performance, it can be clearly seen that developing new chemical structures should be the most feasible way to cope with the problems in searching blue-emitting materials with a high EL performance.…”

Section: Introductionmentioning

confidence: 99%

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

Yao

Yang

et al. 2015

J. Mater. Chem. C

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Section: Introductionmentioning

confidence: 99%

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

Yao

Yang

et al. 2015

J. Mater. Chem. C

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“…However, recent results have shown that the emitters with carbon-carbon triple bonds can still produce very good EL performances in OLEDs. 31 Hence, the problem associated with the triple-bond containing EL materials should be case by case. In this case, the good thermal properties should guarantee the proper application of these phosphorescent copolymers as emitters in PHOLEDs.…”

Section: Thermal Characters Photophysical Properties and Electrochemi...mentioning

confidence: 99%

“…1.40 (m), 1.00-0.93 (m);31 P NMR (161.9 MHz, CDCl 3 , d, ppm): 3.24, 2.81; GPC: M n ¼ 3.6 Â 10 4 g mol À1 , PDI ¼ 1.6 (against polystyrene standards).…”

mentioning

confidence: 99%

Platinum(ii) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: synthesis, photophysical, electrochemistry, and electrophosphorescent investigation

et al. 2015

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Promoting triplet energy-transfer in novel phosphorescent polymers with platinum(II) polymetallayne backbones to achieve high EL performances with η L of 11.49 cd A -1 , η ext of 4.38% and η P of 3.78 lm W -1 . Abstract:Two series of new phosphorescent copolymers with bicarbazole-based platinum(II) polymetallayne backbone have been successfully prepared through Sonogashira cross-coupling with different Ir III ppy-type (ppy=2-phenylpyridine anion) complexes as phosphorescent centers.The photophysical investigations not only indicate highly efficient triplet energy-transfer process from the polymetallayne segments to the phosphorescent units in the polymer solution, but also figure out the structure-property relationship between the triplet energy-transfer process and the energy-levels of different excited states. In addition, the phosphorescent copolymers can furnish yellow-emitting phosphorescent OLEDs (PHOLEDs) with high EL efficiencies with current efficiency ( L ) of 11.49 cd A -1 , external quantum efficiency ( ext ) of 4.38%, power efficiency ( P ) of 3.78 lm W -1 , and red-emitting PHOLEDs with  L of 5.86 cd A -1 ,  ext of 10.1%,  P of 2.29 lm W -1 , representing very decent electroluminescent performances ever achieved by the phosphorescent copolymers. This work herein not only furnishes very important clues for further polishing this category novel phosphorescent polymer, but also provides a new approach to design and synthesis of highly efficient phosphorescent copolymers. phosphorescent polymers. Playing the same role of the host materials in the phosphorescent OLEDs with small molecular triplet emitters, the organic segments in the phosphorescent polymers can act as the host of the phosphorescent blocks. Thus, the emission layer (EML) in PHOLEDs can be easily constructed by directly spin-coating a solution of the phosphorescent polymers, which can greatly simplify the device fabrication. Similar to their fluorescent counterparts, PHOLEDs also relates to the charge carrier injection/transporting in their EMLs.Thus, it seems that the phosphorescent polymers with conjugated backbones are preferred to promote the charge carrier injection/transporting in the EML of PHOLEDs. Another critical issue should be addressed in PHOLEDs based on conjugated phosphorescent polymers is blocking the undesired reverse energy-transfer from the emissive triplet states of the phosphorescent units to the non-emissive triplet states of the conjugated backbones in the phosphorescent polymers. 5 In order to achieve high EL performance in PHOLEDs, the reverse energy-transfer process should be restrained as far as possible. With the aim to fulfill this purpose, increasing the triplet energy level of the backbones of phosphorescent polymers should be a feasible way. Hence, the phosphorescent polymers with nonconjugated backbones have also been prepared. Clearly, this type polymer backbone seems unfavorable for charge carrier injection/transporting. In order to overcome the weakness associated with the nonconjugated backbones ...

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“…However, it might be case by case, since emitters with carbon-carbon triple bonds have been successfully employed to construct high-performance OLEDs. 27 Hence, the good thermal properties associated with these phosphorescent polymers should guarantee their proper application in PHOLEDs.…”

Section: Thermal Properties and Photophysical Charactersmentioning

confidence: 99%

Enhancing the electroluminescence performances of novel platinum(ii) polymetallayne-based phosphorescent polymers through employing functionalized Ir^III phosphorescent units and facilitating triplet energy transfer

et al. 2015

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High-efficiency and deep-blue fluorescent organic light-emitting diodes with the easily controlled doping concentrations

Cited by 22 publications

References 37 publications

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

Platinum(ii) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: synthesis, photophysical, electrochemistry, and electrophosphorescent investigation

Enhancing the electroluminescence performances of novel platinum(ii) polymetallayne-based phosphorescent polymers through employing functionalized Ir^III phosphorescent units and facilitating triplet energy transfer

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High-efficiency and deep-blue fluorescent organic light-emitting diodes with the easily controlled doping concentrations

Cited by 22 publications

References 37 publications

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

Effective blocking of the molecular aggregation of novel truxene-based emitters with spirobifluorene and electron-donating moieties for furnishing highly efficient non-doped blue-emitting OLEDs

Platinum(ii) polymetallayne-based phosphorescent polymers with enhanced triplet energy-transfer: synthesis, photophysical, electrochemistry, and electrophosphorescent investigation

Enhancing the electroluminescence performances of novel platinum(ii) polymetallayne-based phosphorescent polymers through employing functionalized IrIII phosphorescent units and facilitating triplet energy transfer

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Enhancing the electroluminescence performances of novel platinum(ii) polymetallayne-based phosphorescent polymers through employing functionalized Ir^III phosphorescent units and facilitating triplet energy transfer