National Tsing Hua University Institutional Repository:Rapid intersystem crossing in highly phosphorescent iridium complexes
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    National Tsing Hua University Institutional Repository > 理學院 > 化學系 > 期刊論文 >  Rapid intersystem crossing in highly phosphorescent iridium complexes


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    题名: Rapid intersystem crossing in highly phosphorescent iridium complexes
    作者: Tang, KC;Liu, KL;Chen, IC
    教師: 陳益佳
    日期: 2004
    出版者: Elsevier
    關聯: CHEMICAL PHYSICS LETTERS, Elsevier, Volume 386, Issue 4-6, MAR 11 2004, Pages 437-441
    关键词: LIGHT-EMITTING DEVICES
    EXCITED-STATE EVOLUTION
    HIGH-BRIGHTNESS
    CHARGE-TRANSFER
    DYNAMICS
    DIODES
    RUTHENIUM(II)
    摘要: Femtosecond time-resolved absorption measurements on Ir complexes are performed. On excitation at wavelength 400 nm, singlet metal-to-ligand charge-transfer (MLCT) states are excited. On probing at 580 nm, a transient absorption appears with time constant 70-100 fs. This transient state rising rapidly but decaying very slowly is assigned to be the lowest triplet MLCT state. Accordingly intersystem crossing in these Ir complexes is rapid. Measured with a nanosecond laser, emission from the lowest triplet MLCT state decays with lifetimes 1.55, 1.65 and 1.7 mus for Ir(PPY)(3), Ir(DBQ)(2)(acac) and Ir(MDQ)(2)(acac), respectively. On 266-nm excitation with a femtosecond laser, high-energy states with mostly pi-pi* character (ligand-centered states) are accessed; they relax to the lowest triplet MLCT state with time constant 100-350 fs. The efficient flow of energy from high-energy electronic states to (MLCT)-M-3 results in high quantum yield in electroluminescent phosphorescence in organic light-emitting diodes.
    URI: http://www.elsevier.com/
    http://nthur.lib.nthu.edu.tw/dspace/handle/987654321/57046
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