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Journal of Physical Chemistry C
Volumn 111, Issue 10, 2007, Pages 4052-4060
Direct spectroscopic observation of interligand energy transfer in cyclometalated heteroleptic iridium(III) complexes: A strategy for phosphorescence color tuning and white light generation
Author keywords

[No Author keywords available]
Indexed keywords

COMPLEXATION; COMPUTATION THEORY; DENSITY FUNCTIONAL THEORY; ELECTROCHEMISTRY; IRIDIUM; TUNING;
EID: 34047248936     PISSN: 19327447     EISSN: 19327455     Source Type: Journal    
DOI: 10.1021/jp0702550     Document Type: Article
Times cited : (118)
References (78)
  • 58
    • 34047254065 scopus 로고    scopus 로고
    • For the sake of complete explanation, some of the steady state absorption and photoluminescence data in Figure 1 and Table 1 were reproduced from our previous communication.
    • For the sake of complete explanation, some of the steady state absorption and photoluminescence data in Figure 1 and Table 1 were reproduced from our previous communication.
  • 64
    • 34047268115 scopus 로고    scopus 로고
    • Although the ΔE (Eox, Ered) value does not exactly match phosphorescence energy of the corresponding Ir(III) complex, LUMO tuning with ancillary ligands can be evidenced by a linear proportionality between them
    • red) value does not exactly match phosphorescence energy of the corresponding Ir(III) complex, LUMO tuning with ancillary ligands can be evidenced by a linear proportionality between them.
  • 66
    • 34047243960 scopus 로고    scopus 로고
    • See the Supporting Information for data of other Ir(III) complexes
    • See the Supporting Information for data of other Ir(III) complexes.
  • 67
    • 34047267603 scopus 로고    scopus 로고
    • The early stage spectrum of 3 can be safely assigned as cyclometalating ligand-centered phosphorescence from the facts that (1) fluorescence from the free ancillary ligand (quinaldic acid)' was observed at 374 nm, thus eliminating contamination by fluorescence from the residual ancillary ligand (see the Supporting Information), and (2) all of 3 to 6, whose LUMOs exist in the ancillary ligands, showed early stage spectra with identical spectral position, excluding a possibility of singlet emission from Ir(III) complexes.
    • The early stage spectrum of 3 can be safely assigned as cyclometalating ligand-centered phosphorescence from the facts that (1) fluorescence from the free ancillary ligand (quinaldic acid)' was observed at 374 nm, thus eliminating contamination by fluorescence from the residual ancillary ligand (see the Supporting Information), and (2) all of 3 to 6, whose LUMOs exist in the ancillary ligands, showed early stage spectra with identical spectral position, excluding a possibility of singlet emission from Ir(III) complexes.
  • 68
    • 34047263734 scopus 로고    scopus 로고
    • Instrument response function (IRF) was determined to be a Gaussian curve with a time constant of 13.04 ns. The decay fittings were made by using a least-squares deconvolution fitting process (LIFETIME program with an iterative nonlinear least-squares deconvolution procedure developed at the University of Pennsylvania, which ensures a temporal resolution of one third of IRF time constant. Practically, a time constant different from IRF time can be determined. In addition, our transient curves were averaged after accumulating thousands of times. We can find the difference in the initial rise of the prompt emission (C∧N) and the delayed emission (LX) of 3 in Figure 3d
    • Instrument response function (IRF) was determined to be a Gaussian curve with a time constant of 13.04 ns. The decay fittings were made by using a least-squares deconvolution fitting process (LIFETIME program with an iterative nonlinear least-squares deconvolution procedure developed at the University of Pennsylvania), which ensures a temporal resolution of one third of IRF time constant. Practically, a time constant different from IRF time can be determined. In addition, our transient curves were averaged after accumulating thousands of times. We can find the difference in the initial rise of the prompt emission (C∧N) and the delayed emission (LX) of 3 in Figure 3d.
  • 69
    • 34047274739 scopus 로고    scopus 로고
    • ILET time scale of the ns regime can be rationalized by the fact that energy transfer takes place between spatially separated ligands cyclometalating dfppy and ancillary ligand
    • ILET time scale of the ns regime can be rationalized by the fact that energy transfer takes place between spatially separated ligands (cyclometalating dfppy and ancillary ligand).
  • 74
  • 78
    • 34047265613 scopus 로고    scopus 로고
    • ET = (τ - τ′)/τ, where.τ and τ′ denote the phosphorescence lifetime of 1 in the absence and presence of energy accepting red emitters, respectively.
    • ET = (τ - τ′)/τ, where.τ and τ′ denote the phosphorescence lifetime of 1 in the absence and presence of energy accepting red emitters, respectively.

* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.