High-efficiency blue light-emitting electrophosphorescent device with conjugated polymers as the host

Zhang, Xiuju; Jiang, Changyun; Mo, Yueqi; Xu, Yang; Shi, Huahong; Cao, Yong

doi:10.1063/1.2167788

Cited by 60 publications

(47 citation statements)

References 19 publications

(10 reference statements)

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“…That is to say, FIrpic was completely quenched even at high doping concentrations. Similar quenching phenomena have been observed before for conjugated polymers [20,21,23]. Previous studies showed that the lower triplet energy level of the polymer host would cause energy back transfer from phosphorescent dye to polymer, leading to phosphorescent quenching [20,21,[23][24][25].…”

Section: Methodssupporting

confidence: 60%

“…Similar quenching phenomena have been observed before for conjugated polymers [20,21,23]. Previous studies showed that the lower triplet energy level of the polymer host would cause energy back transfer from phosphorescent dye to polymer, leading to phosphorescent quenching [20,21,[23][24][25]. A schematic diagram of the energy levels for PFO, FIrpic and PVK is displayed in Figure 2. Since the triplet energy level of PFO (2.3 eV) [20] is lower than that of FIrpic (2.65 eV) [26], energy back transfer occurs from the triplet excitons on the FIrpic to the low-lying triplet states of PFO that causes the FIrpic quenching.…”

Section: Methodsmentioning

confidence: 49%

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High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes

et al. 2012

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Highly-efficient blue phosphorescent light-emitting diodes were fabricated based on a conjugated-polymer host by doping bis(2-(4,6-difluorophenyl)-pyridinato-N,C2′) picolinate (FIrpic) into poly(9,9-dioctylfluorene) (PFO). Previously, conjugated polymers were not considered as potential hosts for blue phosphorescent dyes because of their low-lying triplet energy levels. Energy back transfer would occur and lead to poor luminescent efficiency in both photoluminescence (PL) and electroluminescence (EL) processes. However, by inserting a hole-transporting layer of poly(N-vinylcarbazole) (PVK), the energy back transfer was suppressed. At low FIrpic-doping concentrations, PFO emissions were completely quenched; with 8 wt% FIrpic, a maximum luminous efficiency of 11.5 cd/A was achieved.

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Section: Methodssupporting

confidence: 60%

Section: Methodsmentioning

confidence: 49%

High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes

et al. 2012

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“…Cao and coworkers also observed an interesting phenomenon whereby the PL spectrum of the polymer/iridium blend showed emission from the polymer only while the EL spectrum showed emission from the iridium complex alone (Fig. 4) [47]. This difference in PL and EL spectra was attributed to a Förster transfer mechanism in the PL process in contrast to a charge trapping mechanism in the EL process.…”

Section: Organic Electronic Devicesmentioning

confidence: 91%

“…No emission was detected from the polymer indicating complete energy transfer from the polymer host to the green dopant. Cao and coworkers reported a similar system with a blue phosphorescent iridium dopant [47]. In comparison with the use of polyvinylcarbazole (PVK) as the polymer host, poly(3,6-dibenzosilole) 36 devices gave much higher external quantum and luminous efficiencies.…”

Section: Organic Electronic Devicesmentioning

confidence: 96%

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Poly(dibenzosilole)s

Wong

Holmes

Polyfluorenes

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Silole‐Containing Conjugated Polymers

Lam

Chen

Dong

et al. 2010

Design and Synthesis of Conjugated Polymers

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Conjugated polymers have drawn broad attention owing to their important applications in polymeric light-emitting diodes (PLEDs) [1, 2], photovoltaic cells (PVCs) [3], field-effect transistors (FETs) [4], and their chemosensing abilities of various targets [5]. Solution processing of the conjugated polymers, such as spin coating and printing, is the attractive advantage in the fabrications of large-area optoelectronic devices. Conjugated polymers are the best candidates that can be used to fabricate flexible optoelectronic devices [6]. A notable feature of conjugated polymers also lies in the enormous versatility of synthetic methodology, which affords wide scope to construct new polymers with improved properties.Siloles [7][8][9][10] or silacyclopentadienes are a group of five-membered silacyclics that possess σ * −π * conjugation arising from the interaction between the σ * orbital of two exocyclic σ -bonds on the silicon atom and the π * orbital of the butadiene moiety [11]. The calculated LUMO level of a silole ring is lower than that of other heterocyclopentadienes, such as pyrrole, furan, and thiophene [10,11]. The unique aromaticity and the low-lying LUMO level endue siloles with intriguing optoelectronic properties. Siloles 1−4, as shown in Scheme 8.1, are the typical building blocks to construct various silole-containing polymers (SCPs).Up to six substituents can be attached to the simple silole ring of 1, which allows considerable room for tuning the optoelectronic properties. 2,3,4,5-Tetraarylsiloles, normally possessing noncoplanar geometry, are the widely studied silole small molecules [7,[12][13][14][15][16][17][18][19][20][21][22][23]. The distances between silole cores of any two adjacent 2,3,4,5-tetraarylsilole molecules, even in the solid state, are far from the normal π -π interaction distance (about 3−4Å), as found in the crystal structures [13]. Two unusual photophysical properties, aggregation-induced emission (AIE) [13,24] and blueshift of photoluminescence (PL) emission in the crystal state compared to that in amorphous solids [25], have been found for 2,3,4,5-tetraphenylsiloles.

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High-efficiency blue light-emitting electrophosphorescent device with conjugated polymers as the host

Cited by 60 publications

References 19 publications

High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes

High-efficiency conjugated-polymer-hosted blue phosphorescent light-emitting diodes

Poly(dibenzosilole)s

Silole‐Containing Conjugated Polymers

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