Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 5, Issue 15, Pages 6826-6831Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am402032z
Keywords
organic light-emitting diode (OLED); time-of-flight; exciplex; bilayer interface; reverse intersystem crossing (RISC); C-3-symmetry
Funding
- National Science Council of Taiwan [NSC 100-2112-M-019-002-MY3, 1O1-2113-M-002-009-MY3, 101-2628-M-002-008]
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A simple three-layer interfacial-type yellow emission exciplex device with an external quantum efficiency as high as 7.7% has been successfully achieved by combining conformation compatible C-3-symmetric hole-transporting TCTA and electron-transporting 3P-T2T. The excellent and balanced charge-transporting properties of TCTA and 3P-T2T and the large energy-levels offset (0.8 eV) of TCTA/3P-T2T interface play important roles for the efficient exciplexes formation, which are effectively confined around the interfacial region due to the high triplet energies (2.85 eV) of TCTA and 3P-T2T. The high-performance OLED was believed to be from the effective harvest of exciplex triplet excitons via reverse intersystem crossing process.
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