Journal
CHINESE PHYSICS B
Volume 29, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1056/ab5933
Keywords
organic light-emitting diode; anode buffer layer; metal phthalocyanine; solution process
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Funding
- Shenzhen Personal Maker Project, China [GRCK2017082316173208]
- Shenzhen Overseas High-level Talents Innovation Plan of Technical Innovation, China [KQJSCX20180323140712012]
- Special Funds for the Development of Strategic Emerging Industries in Shenzhen, China [JCJY20170818154457845]
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Two soluble tetraalkyl-substituted zinc phthalocyanines (ZnPcs) for use as anode buffer layer materials in tris(8-hydroxyquinoline)aluminum (Alq(3))-based organic light-emitting diodes (OLEDs) are presented in this work. The hole-blocking properties of these ZnPc layers slowed the hole injection process into the Alq(3) emissive layer greatly and thus reduced the production of unstable cationic Alq(3) (Alq(3)(+)) species. This led to the enhanced brightness and efficiency when compared with the corresponding properties of OLEDs based on the popular poly-(3, 4-ethylenedioxythiophene): poly(styrene sulfonate) (PEDOT: PSS) buffer layer. Furthermore, because of the high thermal and chemical stabilities of these ZnPcs, a nonaqueous film fabrication process was realized together with improved charge balance in the OLEDs and enhanced OLED lifetimes.
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