Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents

Bong Soo Kim; Sung Hoon Joo; Dongkeun Oh; Soon Wook Cha; Don Soo Choi; Cheol Eui Lee; Jung Il Jin

doi:10.1016/j.synthmet.2004.05.010

Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents

Bong Soo Kim, Sung Hoon Joo, Dongkeun Oh, Soon Wook Cha, Don Soo Choi, Cheol Eui Lee, Jung Il Jin

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

10 Citations (Scopus)

Abstract

Two new blue-light emitters, 3,6-bis(4-carbazolylstyryl)-N-4- methylphenylcarbazole (Cz₃) and 3,6-bis[4-(3,6-dicyanocarbazolyl) styryl]-N-4-methylphenylcarbazole (Cz₃(CN)₄), were found to form high glass-transition temperature (T_g), amorphous organic glasses, when vacuum deposited. Cz₃(CN)₄ exhibited a much higher T_g value (242°C) than Cz₃ (163°C). It was found that Cz₃ is an excellent hole transporter (μ_h⁺ = 1.3 × 10^-4cm²/Vs, μ_e^- = 2.8 × 10^-8cm²/Vs) while Cz₃(CN)₄ shows a faster electron mobility (μ_e^- = 3.1 × 10^-6cm²/Vs) than hole mobility (μ_h⁺ = 2.0 × 10 ^-8cm²/Vs), which is perceived to tell us that the presence of the electron-attracting nitrile (C≡N) groups facilitates the electron mobility. The single layer electroluminescence (EL) device (ITO/EML/Li:Al) of Cz₃(CN)₄ performed much better (external quantum efficiency ∼3.0 × 10^-2%) than that of Cz₃ (external quantum efficiency ∼1.2 × 10^-3%).

Original language	English
Pages (from-to)	229-235
Number of pages	7
Journal	Synthetic Metals
Volume	145
Issue number	2-3
DOIs	https://doi.org/10.1016/j.synthmet.2004.05.010
Publication status	Published - 2004 Sept 21

Bibliographical note

Funding Information:
This work was supported by the Korea Science and Engineering Foundation through CMR of Korea University. B.S. Kim and S.-H. Joo are recipients of the Brain Korea 21 scholarship from the Ministry of Education and Human Resources, Korea.

Keywords

Electroluminescence
Light sources
Organic semiconductor based on molecules

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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10.1016/j.synthmet.2004.05.010

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@article{00e9bbd72dd84c0696c271d0a215ec3c,

title = "Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents",

abstract = "Two new blue-light emitters, 3,6-bis(4-carbazolylstyryl)-N-4- methylphenylcarbazole (Cz3) and 3,6-bis[4-(3,6-dicyanocarbazolyl) styryl]-N-4-methylphenylcarbazole (Cz3(CN)4), were found to form high glass-transition temperature (Tg), amorphous organic glasses, when vacuum deposited. Cz3(CN)4 exhibited a much higher Tg value (242°C) than Cz3 (163°C). It was found that Cz3 is an excellent hole transporter (μh+ = 1.3 × 10-4cm2/Vs, μe- = 2.8 × 10-8cm2/Vs) while Cz3(CN)4 shows a faster electron mobility (μe- = 3.1 × 10-6cm2/Vs) than hole mobility (μh+ = 2.0 × 10 -8cm2/Vs), which is perceived to tell us that the presence of the electron-attracting nitrile (C≡N) groups facilitates the electron mobility. The single layer electroluminescence (EL) device (ITO/EML/Li:Al) of Cz3(CN)4 performed much better (external quantum efficiency ∼3.0 × 10-2%) than that of Cz3 (external quantum efficiency ∼1.2 × 10-3%).",

keywords = "Electroluminescence, Light sources, Organic semiconductor based on molecules",

author = "Kim, {Bong Soo} and Joo, {Sung Hoon} and Dongkeun Oh and Cha, {Soon Wook} and Choi, {Don Soo} and Lee, {Cheol Eui} and Jin, {Jung Il}",

note = "Funding Information: This work was supported by the Korea Science and Engineering Foundation through CMR of Korea University. B.S. Kim and S.-H. Joo are recipients of the Brain Korea 21 scholarship from the Ministry of Education and Human Resources, Korea.",

year = "2004",

month = sep,

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doi = "10.1016/j.synthmet.2004.05.010",

language = "English",

volume = "145",

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journal = "Synthetic Metals",

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T1 - Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents

AU - Kim, Bong Soo

AU - Joo, Sung Hoon

AU - Oh, Dongkeun

AU - Cha, Soon Wook

AU - Choi, Don Soo

AU - Lee, Cheol Eui

AU - Jin, Jung Il

N1 - Funding Information: This work was supported by the Korea Science and Engineering Foundation through CMR of Korea University. B.S. Kim and S.-H. Joo are recipients of the Brain Korea 21 scholarship from the Ministry of Education and Human Resources, Korea.

PY - 2004/9/21

Y1 - 2004/9/21

N2 - Two new blue-light emitters, 3,6-bis(4-carbazolylstyryl)-N-4- methylphenylcarbazole (Cz3) and 3,6-bis[4-(3,6-dicyanocarbazolyl) styryl]-N-4-methylphenylcarbazole (Cz3(CN)4), were found to form high glass-transition temperature (Tg), amorphous organic glasses, when vacuum deposited. Cz3(CN)4 exhibited a much higher Tg value (242°C) than Cz3 (163°C). It was found that Cz3 is an excellent hole transporter (μh+ = 1.3 × 10-4cm2/Vs, μe- = 2.8 × 10-8cm2/Vs) while Cz3(CN)4 shows a faster electron mobility (μe- = 3.1 × 10-6cm2/Vs) than hole mobility (μh+ = 2.0 × 10 -8cm2/Vs), which is perceived to tell us that the presence of the electron-attracting nitrile (C≡N) groups facilitates the electron mobility. The single layer electroluminescence (EL) device (ITO/EML/Li:Al) of Cz3(CN)4 performed much better (external quantum efficiency ∼3.0 × 10-2%) than that of Cz3 (external quantum efficiency ∼1.2 × 10-3%).

AB - Two new blue-light emitters, 3,6-bis(4-carbazolylstyryl)-N-4- methylphenylcarbazole (Cz3) and 3,6-bis[4-(3,6-dicyanocarbazolyl) styryl]-N-4-methylphenylcarbazole (Cz3(CN)4), were found to form high glass-transition temperature (Tg), amorphous organic glasses, when vacuum deposited. Cz3(CN)4 exhibited a much higher Tg value (242°C) than Cz3 (163°C). It was found that Cz3 is an excellent hole transporter (μh+ = 1.3 × 10-4cm2/Vs, μe- = 2.8 × 10-8cm2/Vs) while Cz3(CN)4 shows a faster electron mobility (μe- = 3.1 × 10-6cm2/Vs) than hole mobility (μh+ = 2.0 × 10 -8cm2/Vs), which is perceived to tell us that the presence of the electron-attracting nitrile (C≡N) groups facilitates the electron mobility. The single layer electroluminescence (EL) device (ITO/EML/Li:Al) of Cz3(CN)4 performed much better (external quantum efficiency ∼3.0 × 10-2%) than that of Cz3 (external quantum efficiency ∼1.2 × 10-3%).

KW - Electroluminescence

KW - Light sources

KW - Organic semiconductor based on molecules

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U2 - 10.1016/j.synthmet.2004.05.010

DO - 10.1016/j.synthmet.2004.05.010

M3 - Article

AN - SCOPUS:4344623389

SN - 0379-6779

VL - 145

SP - 229

EP - 235

JO - Synthetic Metals

JF - Synthetic Metals

IS - 2-3

ER -

Charge mobilities and luminescence characteristics of blue-light emitting bent carbazole trimers connected through vinylene linkers - Effect of nitrile substituents

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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