Green Phosphorescent Dendrimer for Light‐Emitting Diodes

Highly efficient organic LEDs made by solution processing are reported. It is shown that the dendritic architecture (see Figure) can be used to solubilize luminescent chromophores and form uniform films of blends. The simple device structures containing a light-emitting chromophore are amongst the most efficient solution-processed devices reported. Thanks to this technique, the inkjet printing of phosphorescent materials becomes feasible.

[1]  S. T. Lee,et al.  Reduction of Self‐Quenching Effect in Organic Electrophosphorescence Emitting Devices via the Use of Sterically Hindered Spacers in Phosphorescence Molecules , 2001 .

[2]  Ying Wang,et al.  Highly efficient electroluminescent materials based on fluorinated organometallic iridium compounds , 2001 .

[3]  W. Marshall,et al.  New, efficient electroluminescent materials based onorganometallic Ir complexes , 2001 .

[4]  Chang-Lyoul Lee,et al.  Polymer phosphorescent light-emitting devices doped with tris(2-phenylpyridine) iridium as a triplet emitter , 2000 .

[5]  Ifor D. W. Samuel,et al.  Measurement of absolute photoluminescence quantum efficiencies in conjugated polymers , 1995 .

[6]  I. Samuel,et al.  A Facile Iterative Procedure for the Preparation of Dendrimers Containing Luminescent Cores and Stilbene Dendrons , 1999 .

[7]  Daniel Moses,et al.  High‐Efficiency Polymer‐Based Electrophosphorescent Devices , 2002 .

[8]  Jeffrey S. Moore,et al.  Electroluminescent diodes from a single component emitting layer of dendritic macromolecules , 1996 .

[9]  J. Demas,et al.  Measurement of photoluminescence quantum yields. Review , 1971 .

[10]  A. Tullo.  FLAT-PANEL FURY: Competition looms between LCDs and new organic light-emitting diode technology , 2001 .

[11]  J. Fréchet,et al.  Dendrimer-Containing Light-Emitting Diodes: Toward Site-Isolation of Chromophores , 2000 .

[12]  Tetsuo Tsutsui,et al.  Use of Poly(9-vinylcarbazole) as Host Material for Iridium Complexes in High-Efficiency Organic Light-Emitting Devices , 2000 .

[13]  Antoine Kahn,et al.  Organic semiconductor heterointerfaces containing bathocuproine , 1999 .

[14]  W. R. Salaneck,et al.  Electroluminescence in conjugated polymers , 1999, Nature.

[15]  Shizuo Tokito,et al.  Highly efficient phosphorescence from organic light-emitting devices with an exciton-block layer , 2001 .

[16]  Stephen R. Forrest,et al.  Endothermic energy transfer: A mechanism for generating very efficient high-energy phosphorescent emission in organic materials , 2001 .

[17]  Stephen R. Forrest,et al.  High-efficiency red electrophosphorescence devices , 2001 .

[18]  A. S. Dhoot,et al.  Spin-dependent exciton formation in π-conjugated compounds , 2001, Nature.

[19]  Neal R. Armstrong,et al.  Electrochemistry and Electrogenerated Chemiluminescence Processes of the Components of Aluminum Quinolate/Triarylamine, and Related Organic Light-Emitting Diodes , 1998 .

[20]  Jean M. J. Fréchet,et al.  Light-harvesting dendrimers , 2000 .

[21]  H. Bässler,et al.  Control of mobility in molecular organic semiconductors by dendrimer generation , 2001 .

[22]  S. Forrest,et al.  VERY HIGH-EFFICIENCY GREEN ORGANIC LIGHT-EMITTING DEVICES BASED ON ELECTROPHOSPHORESCENCE , 1999 .

[23]  H. Bässler,et al.  Control of Charge Transport and Intermolecular Interaction in Organic Light-Emitting Diodes by Dendrimer Generation , 2001 .

[24]  I. Samuel,et al.  Control of colour and charge injection in conjugated dendrimer/polypyridine bilayer leds , 1999 .

[25]  Ifor D. W. Samuel,et al.  High-efficiency green phosphorescence from spin-coated single-layer dendrimer light-emitting diodes , 2002 .

[26]  M. Wong,et al.  Synthesis and light-emitting properties of difunctional dendritic distyrylstilbenes , 2001 .

[27]  Richard J. Watts,et al.  Excited-state properties of a triply ortho-metalated iridium(III) complex , 1985 .

[28]  Tetsuo Tsutsui,et al.  High Quantum Efficiency in Organic Light-Emitting Devices with Iridium-Complex as a Triplet Emissive Center , 1999 .

[29]  I. Samuel,et al.  CONJUGATED DENDRIMERS FOR LIGHT-EMITTING DIODES : EFFECT OF GENERATION , 1999 .

[30]  I. Samuel,et al.  Control of electrophosphorescence in conjugated dendrimer light-emitting diodes , 2001 .

[31]  Ching Wan Tang,et al.  Bright-blue electroluminescence from a silyl-substituted ter-(phenylene–vinylene) derivative , 1999 .

[32]  I. Samuel,et al.  The optoelectronic properties of electroluminescent dendrimers , 2001 .