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Volumn 100, Issue 1, 2006, Pages

Improving operating lifetime of organic light-emitting diodes with polycyclic aromatic hydrocarbons as aggregating light-emitting-layer additives

Author keywords

[No Author keywords available]

Indexed keywords

EXTERNAL QUANTUM EFFICIENCIES (EQE); LIGHT-EMITTING-LAYER (LEL); ORGANIC LIGHT-EMITTING DIODE TECHNOLOGY;

EID: 33746210327     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.2214535     Document Type: Article
Times cited : (26)

References (30)
  • 18
    • 33746202341 scopus 로고    scopus 로고
    • note
    • 3|2100 Å Mg:Ag 20:1. ITO is the anode and Mg:Ag is the cathode.
  • 20
    • 33746230317 scopus 로고    scopus 로고
    • note
    • A J-aggregate is characterized by the absorption and emission transitions, which have lower energies relative to those of the monomer and relatively large oscillator strength (spectral intensity).
  • 21
    • 33746230318 scopus 로고    scopus 로고
    • note
    • 3.
  • 22
    • 33746246144 scopus 로고    scopus 로고
    • note
    • For example, solution electrochemistry indicates that perylene is 0.18 V easier to oxidize and 0.24 V easier to reduce than TBADN. Naphtho [2,3-a]pyrene (NP) is as easy to oxidize as TBADN but is easier to reduce by 0.32 V. The spectroscopy of dilute solutions indicates that the energy of the lowest excited singlet state is lower for perylene and NP than that for TBADN by 29 and 42 kJ/mol, respectively, and the energy of the lowest triplet state is lower by 21 and ∼40 kJ/mol, respectively. The energies of the lowest excited singlet state and triplet state for the aggregates of the additives are probably even lower.
  • 23
    • 33746246143 scopus 로고    scopus 로고
    • note
    • This observation is made only as suggestive. An alternative explanation would assume that the EL fade is due to both (i) fluorescence quenchers and (ii) nonradiative recombination centers/charge traps and posit that the addition of the PAH alleviates the latter problem more than the former.
  • 27
    • 33746230319 scopus 로고    scopus 로고
    • note
    • 3 devices eight times, reaching 8000 h, while the addition of the 15% -80% TBP leads to a modest ∼ 1.4 times increase (Table II).
  • 30
    • 33746259057 scopus 로고    scopus 로고
    • note
    • For perylene see Ref. 16. For TBP, solution electrochemistry indicates that it is 0.30 V easier to oxidize and 0.12 V easier to reduce than TBADN.


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.