TY - JOUR
T1 - Blue organic electrophosphorescence diodes using diarylamino-substituted heterocyclic compounds as host material
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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U2 - 10.2494/photopolymer.20.47
DO - 10.2494/photopolymer.20.47
M3 - Article
AN - SCOPUS:34548392698
VL - 20
SP - 47
EP - 51
JO - Journal of Photopolymer Science and Technology
JF - Journal of Photopolymer Science and Technology
SN - 0914-9244
IS - 1
ER -