Comparison of phosphorescence properties of green-emitting Ir(ppy)3 and red-emitting Btp2Ir(acac)

被引：36

作者：

Tanaka, I ^{[1
]}

Tabata, Y

Tokito, S

机构：

[1] NHK Japan Broadcasting Corp, Setagaya Ku, Tokyo 1578510, Japan

[2] Sci Univ Tokyo, Fac Sci, Shinjuku Ku, Tokyo 1628610, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS | 2004年 / 43卷 / 12B期

关键词：

organic light-emitting device; phosphorescence; triplet; Ir(ppy)(3); Btp(2)Ir(acac);

D O I：

10.1143/JJAP.43.L1601

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We report on the phosphorescence properties of green-light-emitting fac tris(2-phenylpyridine) iridium [Ir(ppy)(3)] and redlight-emitting bis[2-(2'-benzothienyl)pyridinato-N,C-3'](acetylacetonate) iridium [Btp(2)Ir(acac)] doped into polycarbonate of 4,4'-N,N'-dicarbazol-biphenyl host matrices. We observed that the phosphorescence intensity of Ir(ppy)(3) was almost independent of temperature. indicating a high phosphorescence quantum yield of nearly 100%. Oil the other hand, the phosphorescence intensity of Btp(2)Ir(acac) gradually decreased with increasing temperature above 200 K. This suggests that the nonradiative processes from triplet states are intrinsic properties, and that the phosphorescence quantum yield is lower than that of Ir(ppy)(3). We discuss the temperature dependence of the transient phosphorescence characteristics.

引用

页码：L1601 / L1603

页数：3

共 19 条

[1] High-efficiency red electrophosphorescence devices [J].

Adachi, C ;

Baldo, MA ;

Forrest, SR ;

Lamansky, S ;

Thompson, ME ;

Kwong, RC .

APPLIED PHYSICS LETTERS, 2001, 78 (11) :1622-1624

[2] Very high-efficiency green organic light-emitting devices based on electrophosphorescence [J].

Baldo, MA ;

Lamansky, S ;

Burrows, PE ;

Thompson, ME ;

Forrest, SR .

APPLIED PHYSICS LETTERS, 1999, 75 (01) :4-6

[3] FACIAL TRIS CYCLOMETALATED RH3+ AND IR3+ COMPLEXES - THEIR SYNTHESIS, STRUCTURE, AND OPTICAL SPECTROSCOPIC PROPERTIES [J].

COLOMBO, MG ;

BRUNOLD, TC ;

RIEDENER, T ;

GUDEL, HU ;

FORTSCH, M ;

BURGI, HB .

INORGANIC CHEMISTRY, 1994, 33 (03) :545-550

[4] A NEW SYNTHETIC ROUTE TO THE PREPARATION OF A SERIES OF STRONG PHOTOREDUCING AGENTS - FAC TRIS-ORTHO-METALATED COMPLEXES OF IRIDIUM(III) WITH SUBSTITUTED 2-PHENYLPYRIDINES [J].

DEDEIAN, K ;

DJUROVICH, PI ;

GARCES, FO ;

CARLSON, G ;

WATTS, RJ .

INORGANIC CHEMISTRY, 1991, 30 (08) :1685-1687

[5] Emission of Ir(ppy)3.: Temperature dependence, decay dynamics, and magnetic field properties [J].

Finkenzeller, WJ ;

Yersin, H .

CHEMICAL PHYSICS LETTERS, 2003, 377 (3-4) :299-305

[6] Unusual phosphorescence characteristics of Ir(ppy)3 in a solid matrix at low temperatures [J].

Goushi, K ;

Kawamura, Y ;

Sasabe, H ;

Adachi, C .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 2-LETTERS & EXPRESS LETTERS, 2004, 43 (7A) :L937-L939

[7] Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer [J].

Ikai, M ;

Tokito, S ;

Sakamoto, Y ;

Suzuki, T ;

Taga, Y .

APPLIED PHYSICS LETTERS, 2001, 79 (02) :156-158

[8] Photochemical mer→fac one-way isomerization of phosphorescent material.: Studies by timeresolved spectroscopy for Tris[2-(4′,6′-difluorophenyl)pyridine]iridium(III) in solution [J].

Karatsu, T ;

Nakamura, T ;

Yagai, S ;

Kitamura, A ;

Yamaguchi, K ;

Matsushima, Y ;

Iwata, T ;

Hori, Y ;

Hagiwara, T .

CHEMISTRY LETTERS, 2003, 32 (10) :886-887

[9] EXCITED-STATE PROPERTIES OF A TRIPLY ORTHO-METALATED IRIDIUM(III) COMPLEX [J].

KING, KA ;

SPELLANE, PJ ;

WATTS, RJ .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1985, 107 (05) :1431-1432

[10] Highly phosphorescent bis-cyclometalated iridium complexes: Synthesis, photophysical characterization, and use in organic light emitting diodes [J].

Lamansky, S ;

Djurovich, P ;

Murphy, D ;

Abdel-Razzaq, F ;

Lee, HE ;

Adachi, C ;

Burrows, PE ;

Forrest, SR ;

Thompson, ME .

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2001, 123 (18) :4304-4312

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