Stabilized blue luminescent polyfluorenes: Introducing polyhedral oligomeric silsesquioxane

Jonghee Lee; Hoon Je Cho; Byung Jun Jung; Nam Sung Cho; Hong Ku Shim

doi:10.1021/ma0497759

Stabilized blue luminescent polyfluorenes: Introducing polyhedral oligomeric silsesquioxane

Jonghee Lee, Hoon Je Cho, Byung Jun Jung, Nam Sung Cho, Hong Ku Shim

Department of Materials Science and Engineering

Korea Advanced Institute of Science and Technology

Research output: Contribution to journal › Article › peer-review

147 Scopus citations

Abstract

A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by ¹H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer formation because the bulky POSS group prohibited interchain interactions. This effective dilution effect and the high thermal stability of the POSS unit also improved the color stability of PFPOSSs blue emission even after thermal annealing at 150°C. The fluorescence quantum yields (Θ_FL) of PFPOSSs in both solution and solid state were higher than those of poly(dialkylfluorene)s. Moreover, the ITO/PEDOT-PSS/polymer/Ca/Al LED device using this polymer as emitting layer showed a very stable blue light emission. LED devices of PFPOSSs showed a low turn-on voltage of 3.7-4.4 V, high brightness of 350-1010 cd/m², and external efficiencies of 0.11-0.36%.

Original language	English
Pages (from-to)	8523-8529
Number of pages	7
Journal	Macromolecules
Volume	37
Issue number	23
DOIs	https://doi.org/10.1021/ma0497759
State	Published - 16 Nov 2004

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title = "Stabilized blue luminescent polyfluorenes: Introducing polyhedral oligomeric silsesquioxane",

abstract = "A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by 1H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer formation because the bulky POSS group prohibited interchain interactions. This effective dilution effect and the high thermal stability of the POSS unit also improved the color stability of PFPOSSs blue emission even after thermal annealing at 150°C. The fluorescence quantum yields (ΘFL) of PFPOSSs in both solution and solid state were higher than those of poly(dialkylfluorene)s. Moreover, the ITO/PEDOT-PSS/polymer/Ca/Al LED device using this polymer as emitting layer showed a very stable blue light emission. LED devices of PFPOSSs showed a low turn-on voltage of 3.7-4.4 V, high brightness of 350-1010 cd/m2, and external efficiencies of 0.11-0.36%.",

author = "Jonghee Lee and Cho, {Hoon Je} and Jung, {Byung Jun} and Cho, {Nam Sung} and Shim, {Hong Ku}",

year = "2004",

month = nov,

day = "16",

doi = "10.1021/ma0497759",

language = "English",

volume = "37",

pages = "8523--8529",

journal = "Macromolecules",

issn = "0024-9297",

publisher = "American Chemical Society",

number = "23",

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T1 - Stabilized blue luminescent polyfluorenes

T2 - Introducing polyhedral oligomeric silsesquioxane

AU - Lee, Jonghee

AU - Cho, Hoon Je

AU - Jung, Byung Jun

AU - Cho, Nam Sung

AU - Shim, Hong Ku

PY - 2004/11/16

Y1 - 2004/11/16

N2 - A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by 1H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer formation because the bulky POSS group prohibited interchain interactions. This effective dilution effect and the high thermal stability of the POSS unit also improved the color stability of PFPOSSs blue emission even after thermal annealing at 150°C. The fluorescence quantum yields (ΘFL) of PFPOSSs in both solution and solid state were higher than those of poly(dialkylfluorene)s. Moreover, the ITO/PEDOT-PSS/polymer/Ca/Al LED device using this polymer as emitting layer showed a very stable blue light emission. LED devices of PFPOSSs showed a low turn-on voltage of 3.7-4.4 V, high brightness of 350-1010 cd/m2, and external efficiencies of 0.11-0.36%.

AB - A new POSS (polyhedral oligomeric silsesquioxane)-substituted polyfluorene was synthesized from the nickel-catalyzed Yamamoto coupling reaction. The synthesized polymers could be well characterized by 1H NMR, FT-IR, and elemental analysis. PL spectra of PFPOSSs on the quartz film showed reduced aggregation/excimer formation because the bulky POSS group prohibited interchain interactions. This effective dilution effect and the high thermal stability of the POSS unit also improved the color stability of PFPOSSs blue emission even after thermal annealing at 150°C. The fluorescence quantum yields (ΘFL) of PFPOSSs in both solution and solid state were higher than those of poly(dialkylfluorene)s. Moreover, the ITO/PEDOT-PSS/polymer/Ca/Al LED device using this polymer as emitting layer showed a very stable blue light emission. LED devices of PFPOSSs showed a low turn-on voltage of 3.7-4.4 V, high brightness of 350-1010 cd/m2, and external efficiencies of 0.11-0.36%.

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U2 - 10.1021/ma0497759

DO - 10.1021/ma0497759

M3 - Article

AN - SCOPUS:9744274646

SN - 0024-9297

VL - 37

SP - 8523

EP - 8529

JO - Macromolecules

JF - Macromolecules

IS - 23

ER -

Stabilized blue luminescent polyfluorenes: Introducing polyhedral oligomeric silsesquioxane

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