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Issue 48, 2014
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A novel intermediate connector with improved charge generation and separation for large-area tandem white organic lighting devices

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Abstract

An intermediate connector (IC) consisting of lithium (Li) doped 4,7-diphenyl-1,10-phenanthroline (BPhen)/Al/tetrafluoro-tetracyanoquinodimethane (F4-TCNQ)/1,4,5,8,9,11-hexaazatriphenylene-hexacarbonitrile (HAT-CN) is developed for fabricating tandem white organic light-emitting diodes (WOLEDs). An investigation of the charge generation and separation process in Bphen:Li/Al/F4-TCNQ/HAT-CN, which is carried out by analysis of the current–voltage and capacitance–voltage characteristics, shows that the proposed IC structure is suitable as a connecting unit in tandem OLEDs. The tandem WOLED based on a silicon compound host material of 10-phenyl-2′-(triphenylsilyl)-10H-spiro [acridine-9,9′-fluorene] (SSTF) with the proposed IC structure exhibits a maximum current efficiency of 159.2 cd A−1 and a maximum power efficiency of 69.4 lm W−1. For application in large-area OLEDs, a 150 × 150 mm2 tandem lighting panel with maximum efficiencies of 231.8 cd A−1 and 52.9 lm W−1, correlated color temperature of 3000 K and Commission International de I'Eclairage (CIE) coordinates of (0.34, 0.45) is also demonstrated.

Graphical abstract: A novel intermediate connector with improved charge generation and separation for large-area tandem white organic lighting devices

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Publication details

The article was received on 16 Sep 2014, accepted on 30 Oct 2014 and first published on 03 Nov 2014


Article type: Paper
DOI: 10.1039/C4TC02082K
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Citation: J. Mater. Chem. C, 2014,2, 10403-10408
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    A novel intermediate connector with improved charge generation and separation for large-area tandem white organic lighting devices

    L. Ding, Y. Sun, H. Chen, F. Zu, Z. Wang and L. Liao, J. Mater. Chem. C, 2014, 2, 10403
    DOI: 10.1039/C4TC02082K

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