Excimer and electromer suppression of tetraphenylsilane‐based blue‐light‐emitting polymers

Lee, Rong-Ho; Wang, Yingyu

doi:10.1002/app.27417

Cited by 7 publications

(4 citation statements)

References 26 publications

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“…The other solvents and all commercially available reagents were used without further purification. 2,7-Dibromocarbazole, 13 1-(2-ethylhexyloxy)-4-iodobenzene, 14 and bis(4bromophenyl)diphenylsilane 15 were synthesized according to the procedures reported previously.…”

Section: Methodsmentioning

confidence: 99%

Appropriately Conjugated Poly[oligo(N-phenyl-2,7-carbazolylene)-alt-diphenylsilylene]s

2009

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A series of poly[oligo(2,7-carbazolylene)-alt-diphenylsilylene]s were synthesized by Suzuki couplings by combination of basic monomers, dibromo(oligocarbazole)s, bis(dioxaborolanyl)oligocarbazoles, bis(dioxaborolanylcarbazolyl)diphenylsilanes, and bis(dioxaborolanylphenyl)diphenylsilanes. The polymers consist of the conjugated units of the dimer, trimer, pentamer, heptamer, and nonamer of the N-[p-(2-ethylhexyloxy)phenyl]carbazole-2,7-diyl and the connecting diphenylsilylene portion between the oligomer units. All of the polymers had moderate number-average molecular weights of about 14 000 g/mol and good solubility in toluene. The absorption and emission maxima of these polymers in CHCl3 were in the ranges of 339−381 and 409−413 nm, respectively. A red-shift was observed as the length of the oligocarbazole unit increased less than 6 (heptamer). Poly(pentamer) and poly(heptamer) showed quantitative fluorescence quantum yields in CHCl3. The full width at half-maximum in photoluminescence spectra of these polymers in the solid state became narrower as the conjugation length got longer. The highest occupied molecular orbital and lowest unoccupied molecular orbital energy levels of all of the polymers were located at about −5.6 and −2.6 eV, respectively. Investigations of polymeric light-emitting diodes having a configuration of ITO/PEDOT(PSS)/polymer/CsF/Al suggested that poly(pentamer) and poly(heptamer) had higher performances of L max (>8000 cd/m2) and ηmax (>0.5 cd/A) than the other poly(oligomer)s.

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Section: Methodsmentioning

confidence: 99%

Appropriately Conjugated Poly[oligo(N-phenyl-2,7-carbazolylene)-alt-diphenylsilylene]s

2009

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“…Unlike TPESiPh 3 , the ELs of (TPE) 2 SiPh 2 and (TPE) 3 SiPh are observed at longer wavelengths than the PLs of their solid films, probably due to the microcavity effect or the formation of exci-or electro plexes between the emitter and the charge-transport layer [18][19][20][21]. The EL results, although preliminary, suggest that the TPE-substituted silanes are better blue emitters than most planar fluorophorsubstituted silanes [9,10] and are promising luminescent materials to be useful in OLEDs. …”

Section: Electroluminescencementioning

confidence: 99%

“…Thus, they are outstanding lightemitting materials and warrant further exploration. TPE is a blue luminophor, and silane derivatives show not only good blue light-emitting properties [9,10] but also are utilized as hole-blocking [11,12] and host materials [13][14][15] in blue OLEDs. Combining the two components into one system may result in luminophors with novel optical properties.…”

Section: Introductionmentioning

confidence: 99%

Luminescent tetraphenylethene-substituted silanes

Zhao

Chen

Lam

et al. 2010

Pure and Applied Chemistry

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Tetraphenylethene (TPE)-substitued silanes [(Ph 4 C=C) m Si(Ph) n , m = 3-1, n = 3-1] are designed and synthesized, and their optical, thermal, and electrochemical properties are studied. Whereas they are nonluminescent in solutions, they become highly emissive when aggregated in poor solvents (such as water) or fabricated into thin films, demonstrating a novel phenomenon of aggregation-induced emission (AIE). Their amorphous films exhibit high fluorescence quantum yields (54.6-63.7 %). They enjoy high thermal stability with 5 % weight loss occurring at 320-420 °C. Multilayer electroluminescence (EL) devices (ITO/NPB/emitter/TPBi/LiF/Al) utilizing the silanes as emitting layers are fabricated, which give deep blue EL with maximum luminance and external quantum efficiency of 5672 cd/m 2 , and 1.6 %, respectively.

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“…Conjugated polymers consisting of an electronically delocalized backbone are the materials of choice for optoelectronics, such as in polymer light‐emitting electrochemical cells (PLECs), polymer light‐emitting devices (PLEDs) and polymer solar cells 27–33. Typical PLECs are usually fabricated based on a blend of a conjugated polymer and an ion‐transporting polymer.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of quaternized ammonium iodide‐containing conjugated polymer electrolytes and their application in dye‐sensitized solar cells

Lee

Liu

et al. 2010

Polymer International

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Excimer and electromer suppression of tetraphenylsilane‐based blue‐light‐emitting polymers

Cited by 7 publications

References 26 publications

Appropriately Conjugated Poly[oligo(N-phenyl-2,7-carbazolylene)-alt-diphenylsilylene]s

Appropriately Conjugated Poly[oligo(N-phenyl-2,7-carbazolylene)-alt-diphenylsilylene]s

Luminescent tetraphenylethene-substituted silanes

Synthesis of quaternized ammonium iodide‐containing conjugated polymer electrolytes and their application in dye‐sensitized solar cells

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