Blue organic electrophosphorescence diodes using diarylamino-substituted heterocyclic compounds as host material

Soo Son Kyung; Masayuki Yahiro; Toshiro Imai; Hiroki Yoshizaki; Chihaya Adachi

doi:10.2494/photopolymer.20.47

Blue organic electrophosphorescence diodes using diarylamino-substituted heterocyclic compounds as host material

Soo Son Kyung, Masayuki Yahiro, Toshiro Imai, Hiroki Yoshizaki, Chihaya Adachi

Applied Chemistry

Research output: Contribution to journal › Article

16 Citations (Scopus)

Abstract

Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5- pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine (PYM3), possess a high triplet energy level (T ₁ ) of T ₁ = 2.93 eV (PYD2) and T ₁ = 2.89 eV (PYM3), respectively, in their solid state films. 6wt%-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C ² ] picolinate (FIrpic):PYD2- and 6wt%-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Φ _PL = 88±2 % and Φ _PL =80±1 %, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (η _EL ) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers.

Original language	English
Pages (from-to)	47-51
Number of pages	5
Journal	Journal of Photopolymer Science and Technology
Volume	20
Issue number	1
DOIs	https://doi.org/10.2494/photopolymer.20.47
Publication status	Published - Sep 10 2007

All Science Journal Classification (ASJC) codes

Polymers and Plastics
Organic Chemistry
Materials Chemistry

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Kyung, S. S., Yahiro, M., Imai, T., Yoshizaki, H., & Adachi, C. (2007). Blue organic electrophosphorescence diodes using diarylamino-substituted heterocyclic compounds as host material. Journal of Photopolymer Science and Technology, 20(1), 47-51. https://doi.org/10.2494/photopolymer.20.47

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abstract = " Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5- pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine (PYM3), possess a high triplet energy level (T 1 ) of T 1 = 2.93 eV (PYD2) and T 1 = 2.89 eV (PYM3), respectively, in their solid state films. 6wt%-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C 2 ] picolinate (FIrpic):PYD2- and 6wt%-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Φ PL = 88±2 % and Φ PL =80±1 %, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (η EL ) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers.",

author = "Kyung, {Soo Son} and Masayuki Yahiro and Toshiro Imai and Hiroki Yoshizaki and Chihaya Adachi",

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AU - Kyung, Soo Son

AU - Yahiro, Masayuki

AU - Imai, Toshiro

AU - Yoshizaki, Hiroki

AU - Adachi, Chihaya

PY - 2007/9/10

Y1 - 2007/9/10

N2 - Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5- pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine (PYM3), possess a high triplet energy level (T 1 ) of T 1 = 2.93 eV (PYD2) and T 1 = 2.89 eV (PYM3), respectively, in their solid state films. 6wt%-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C 2 ] picolinate (FIrpic):PYD2- and 6wt%-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Φ PL = 88±2 % and Φ PL =80±1 %, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (η EL ) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers.

AB - Diarylamino-substituted heterocyclic compounds (DHCs), 2,6-dicarbazolo-1,5- pyridine (PYD2) and 2,4,6-tricarbazolo-1,3,5-pyrimidine (PYM3), possess a high triplet energy level (T 1 ) of T 1 = 2.93 eV (PYD2) and T 1 = 2.89 eV (PYM3), respectively, in their solid state films. 6wt%-Iridium(III)bis[(4,6-di-fluorophenyl)-pyridinato-N,C 2 ] picolinate (FIrpic):PYD2- and 6wt%-FIrpic:PYM3-doped films showed high photoluminescence (PL) efficiencies of Φ PL = 88±2 % and Φ PL =80±1 %, indicating near perfect confinement of FIrpic triplet excitons. By increasing the FIrpic concentration in DHC hosts, lower driving voltage and higher external electroluminescence (EL) quantum efficiencies (η EL ) were observed, indicating enhancement of electron injection and transport (electron current) in these emitting layers.

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