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Functional Light-Emitting Materials of Platinum, Zinc and Boron for Organic Optoelectronic Devices: (English)

Functional Light-Emitting Materials of Platinum, Zinc and Boron for Organic Optoelectronic Devices: (English)

          
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About the Book

This dissertation, "Functional Light-emitting Materials of Platinum, Zinc and Boron for Organic Optoelectronic Devices" by 郭子中, Chi-chung, Kwok, was obtained from The University of Hong Kong (Pokfulam, Hong Kong) and is being sold pursuant to Creative Commons: Attribution 3.0 Hong Kong License. The content of this dissertation has not been altered in any way. We have altered the formatting in order to facilitate the ease of printing and reading of the dissertation. All rights not granted by the above license are retained by the author. Abstract: Abstract of thesis entitled FUNCTIONAL LIGHT-EMITTING MATERIALS OF PLATINUM, ZINC AND BORON FOR ORGANIC OPTOELECTRONIC DEVICES Submitted by Kwok Chi Chung For the degree of Doctor of Philosophy at The University of Hong Kong in Nov 2005 This thesis describes the development of a series of new functional materials containing platinum, zinc and boron, which possess high thermal stability, high quantum efficiency, high charge carrier mobilities and good solubility in organic solvents for potential application in organic light-emitting diodes (OLEDs). The photophysical and optoelectronic properties of these materials have been examined. Zinc(II) ion is known to form stable complexes with nitrogen-donor ligands, and the quantum efficiency of the ligand-associated emission is often enhanced upon coordination. Employing a molecular self-assembly approach, zinc(II) coordination polymers derived from bifunctional terpyridines and Schiff bases were prepared. These polymers exhibit excellent thermal stability (decomposition temperature, T, up to do 461 C) and form uniform transparent thin film (thickness 100 nm) by spin coating technique. The zinc(II) terpyridine / Schiff base polymers exhibit blue to orange photoluminescence with quantum efficiency up to 0.77. Using the zinc(II) coordination polymers as emitters, devices with low turn-on voltage of 5 - 6 V and maximum -1 efficiency of 0.8 - 2.6 cd A were obtained. Results of photophysical studies show that the photoluminescence of the zinc(II) polymers is of intraligand origin; based on this finding the emission colors of the coordination polymers were tuned from blue to yellow by changing the substitutions on the monomers. By the self-assembly approach, a series of multinuclear zinc(II) clusters with a Zn O core structure has also been prepared. These zinc(II) clusters, formulated as [Zn OL ] (L = 7-azaindolate derivates), exhibit high thermal stability (T up to 471 C) 4 6 d and high luminance quantum efficiency (up to 0.32). With [Zn O(AID-An) ] (AID-An = 4 6 3-anthracenyl-7-azaindole) as the emitter in an OLED, white-light emission was -2 produced with a maximum luminance of 10790 cd m and power efficiency of 1.3 cd -1 A . These results are the best reported examples among single-emitting component white OLEDs. To achieve full-color display, the [(O DEGREESN DEGREESN)PtX] (HO DEGREESN DEGREESN = 6-(2-hydroxy-phenyl)-2-2'bipyridine and derivatives; X = Cl, Br, I or C≣C-Ph) as potentially red-light emitting materials were prepared. Compared to cyclometalated Pt(II) complexes, these [(O DEGREESN DEGREESN)PtX] complexes are thermally stable (T up to 426 C) and more easily prepared with diverse structure variation. Yellow light-emitting OLEDs -2 with a maximum luminance of 37000 cd m has been fabricated using [(F BuO DEGREESN DEGREESN)PtCl] as emitter. Photophysical studies suggested that the photoluminescence of the [(O DEGREESN DEGREESN)PtX] complexes can be attributed to triplet MLCT 3 and [l →π*(dimine)] (l = lone pair / phenoxide) transitions. The thermal stability of charge transporting materials (CTMs) in OLEDs can be enhanced by incorporation of inorganic elements. A series of thermally stable (T up to 340 C) borazine-based materials has been prepared and studied. 1,3,5-Tris(4-t-butylphenyl)borazine was demonstrated t


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Product Details
  • ISBN-13: 9781361126189
  • Publisher: Open Dissertation Press
  • Publisher Imprint: Open Dissertation Press
  • Height: 279 mm
  • No of Pages: 352
  • Spine Width: 19 mm
  • Width: 216 mm
  • ISBN-10: 1361126183
  • Publisher Date: 26 Jan 2017
  • Binding: Paperback
  • Language: English
  • Series Title: English
  • Weight: 816 gr


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Functional Light-Emitting Materials of Platinum, Zinc and Boron for Organic Optoelectronic Devices: (English)
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