126
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Ribierre JC, Ruseckas A, Knights K, Staton SV, Cumpstey N, Burn PL, Samuel IDW. Triplet exciton diffusion and phosphorescence quenching in iridium(III)-centered dendrimers. PHYSICAL REVIEW LETTERS 2008; 100:017402. [PMID: 18232820 DOI: 10.1103/physrevlett.100.017402] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/30/2007] [Indexed: 05/25/2023]
Abstract
A study of triplet-triplet exciton annihilation and nonradiative decay in films of iridium(III)-centered phosphorescent dendrimers is reported. The average separation of the chromophore was tuned by the molecular structure and also by blending with a host material. It was found that triplet exciton hopping is controlled by electron exchange interactions and can be over 600 times faster than phosphorescence quenching. Nonradiative decay occurs by weak dipole-dipole interactions and is independent of exciton diffusion, except in very thin films (<20 nm) where surface quenching dominates the decay.
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127
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Knights KA, Stevenson SG, Shipley CP, Lo SC, Olsen S, Harding RE, Gambino S, Burn PL, Samuel IDW. A rapid route to carbazole containing dendrons and phosphorescent dendrimers. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b717750j] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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128
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Xi W, Zhang W, An BK, Burn PL, Davis JJ. Tunnelling conductance of vectorial porphyrin monolayers. ACTA ACUST UNITED AC 2008. [DOI: 10.1039/b802824a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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129
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Ribierre JC, Stevenson SG, Samuel IDW, Staton SV, Burn PL. Optimization of the Luminescence Efficiencies in Solution-Processed Phosphorescent Dendrimers. ACTA ACUST UNITED AC 2007. [DOI: 10.1109/jdt.2007.896744] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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130
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Lo SC, Burn PL. Development of Dendrimers: Macromolecules for Use in Organic Light-Emitting Diodes and Solar Cells. Chem Rev 2007; 107:1097-116. [PMID: 17385927 DOI: 10.1021/cr050136l] [Citation(s) in RCA: 516] [Impact Index Per Article: 30.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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131
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Pu YJ, Harding RE, Stevenson SG, Namdas EB, Tedeschi C, Markham JPJ, Rummings RJ, Burn PL, Samuel IDW. Solution processable phosphorescent rhenium(i) dendrimers. ACTA ACUST UNITED AC 2007. [DOI: 10.1039/b707896j] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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132
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Friend RH, Bradley DDC, Brown AR, Graham SC, Halliday DA, Burn PL, Kraft A, Holmes AB. Optoelectronic Device Physics Based on Conjugated Polymers. ACTA ACUST UNITED AC 2006. [DOI: 10.1080/10587259208028745] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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133
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Cumpstey N, Bera RN, Burn PL, Samuel IDW. Investigating the Effect of Steric Crowding in Phosphorescent Dendrimers. Macromolecules 2005. [DOI: 10.1021/ma050609q] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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134
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Lawrence JR, Turnbull GA, Samuel IDW, Richards GJ, Burn PL. Optical amplification in a first-generation dendritic organic semiconductor. OPTICS LETTERS 2004; 29:869-871. [PMID: 15119405 DOI: 10.1364/ol.29.000869] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
We report a study of a new class of organic semiconductor as an optical gain medium. We demonstrate amplification of violet light by use of stimulated emission in a solution of a first-generation bis-fluorene-cored semiconducting dendrimer. Amplification is also observed in the solid state by means of amplified spontaneous emission in an optically pumped dendrimer planar waveguide. Gains of 36 dB cm(-1) at 420 nm and 26 dB cm(-1) at 390 nm in solution and 350 dB cm(-1) in the solid state are obtained. These results show that semiconducting dendrimers have potential as visible laser and amplifier materials.
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135
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Namdas EB, Ruseckas A, Samuel IDW, Lo SC, Burn PL. Photophysics of Fac-Tris(2-Phenylpyridine) Iridium(III) Cored Electroluminescent Dendrimers in Solution and Films. J Phys Chem B 2004. [DOI: 10.1021/jp035664k] [Citation(s) in RCA: 103] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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136
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Armstrong FA, Barlow NL, Burn PL, Hoke KR, Jeuken LJC, Shenton C, Webster GR. Fast, long-range electron-transfer reactions of a "blue" copper protein coupled non-covalently to an electrode through a stilbenyl thiolate monolayer. Chem Commun (Camb) 2004:316-7. [PMID: 14740055 DOI: 10.1039/b312936e] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A self-assembled monolayer (SAM), formed by the insitu saponification of a stilbenyl thioacetate on a gold electrode, yields fast electron transfer (ET)(the exchange rate at zero driving force exceeds 1600 s-1) with adsorbed molecules of the blue copper protein, azurin, over a distance exceeding 15 angstroms .
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137
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Frampton MJ, Namdas EB, Lo SC, Burn PL, Samuel IDW. The synthesis and properties of solution processable red-emitting phosphorescent dendrimers. ACTA ACUST UNITED AC 2004. [DOI: 10.1039/b400160e] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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138
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Barlow NL, Webster G, Flemming B, Guo L, Burn PL, Armstrong FA. Electrode surface structures for studying long-range electron transfer in biological systems. J Inorg Biochem 2003. [DOI: 10.1016/s0162-0134(03)80562-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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139
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Frampton MJ, Magennis SW, Pillow JNG, Burn PL, Samuel IDW. The effect of intermolecular interactions on the electro-optical properties of porphyrin dendrimers with conjugated dendrons. ACTA ACUST UNITED AC 2002. [DOI: 10.1039/b209910c] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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140
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Pålsson LO, Beavington R, Frampton MJ, Lupton JM, Magennis SW, Markham JPJ, Pillow JNG, Burn PL, Samuel IDW. Synthesis and Excited State Spectroscopy of Tris(distyrylbenzenyl)amine-cored Electroluminescent Dendrimers. Macromolecules 2002. [DOI: 10.1021/ma011996g] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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141
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Lupton JM, Samuel IDW, Burn PL, Mukamel S. Control of Intrachromophore Excitonic Coherence in Electroluminescent Conjugated Dendrimers. J Phys Chem B 2002. [DOI: 10.1021/jp020418e] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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142
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Burn PL, Kraft A, Baigent D, Bradley DDC, Brown AR, Friend RH, Gymer RW, Holmes AB, Jackson RW. Chemical tuning of the electronic properties of poly(p-phenylenevinylene)-based copolymers. J Am Chem Soc 2002. [DOI: 10.1021/ja00075a030] [Citation(s) in RCA: 209] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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143
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Mitchell WJ, Pena C, Burn PL. Thermal routes to low HOMO–LUMO energy gap poly(arylenevinylene)s. ACTA ACUST UNITED AC 2001. [DOI: 10.1039/b107044b] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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144
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Lo SC, Pålsson LO, Kilitziraki M, Burn PL, Samuel IDW. Control of polymer–electrode interactions: the effect of leaving group on the optical properties and device characteristics of EHPPV. ACTA ACUST UNITED AC 2001. [DOI: 10.1039/b106115c] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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145
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Promarak V, Burn PL. A new synthetic approach to porphyrin-α-diones and a -2,3,12,13-tetraone: building blocks for laterally conjugated porphyrin arrays. ACTA ACUST UNITED AC 2001. [DOI: 10.1039/b007389j] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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146
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Lo SC, Sheridan AK, Samuel IDW, Burn PL. Comparison of precursor polymer routes to and electronic properties of a new phenylacetylene derivatised poly[2-(2′-ethylhexyloxy)-1,4-phenylenevinylene]. ACTA ACUST UNITED AC 2000. [DOI: 10.1039/a904274a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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147
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Beavington R, Burn PL. Bis-porphyrin arrays. Part 3.† The synthesis of model bis-porphyrin dimers and an electrochemical study. ACTA ACUST UNITED AC 2000. [DOI: 10.1039/a910323f] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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148
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Beavington R, Burn PL. Bis-porphyrin arrays. Part 2.† The synthesis of asymmetrically substituted bis-porphyrins. ACTA ACUST UNITED AC 2000. [DOI: 10.1039/a907059a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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149
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Lupton JM, Hemingway LR, Samuel IDW, Burn PL. Electroluminescence from a new distyrylbenzene based triazine dendrimer. ACTA ACUST UNITED AC 2000. [DOI: 10.1039/a908816d] [Citation(s) in RCA: 62] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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150
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Pillow JNG, Halim M, Lupton JM, Burn PL, Samuel IDW. A Facile Iterative Procedure for the Preparation of Dendrimers Containing Luminescent Cores and Stilbene Dendrons. Macromolecules 1999. [DOI: 10.1021/ma981871k] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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