Fuzzy-junction organic light-emitting devices | Zendy

C.-W. Chen | Zendy; T.-Y. Cho | Zendy; Chien-Yin Wu | Zendy; H.-L. Yu | Zendy; TienYau Luh | Zendy

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Fuzzy-junction organic light-emitting devices

Author(s) -

C.-W. Chen,

T.-Y. Cho,

Chien-Yin Wu,

H.-L. Yu,

TienYau Luh

Publication year - 2002

Publication title -

applied physics letters

Language(s) - English

Resource type - Journals

eISSN - 1077-3118

pISSN - 0003-6951

DOI - 10.1063/1.1502912

Subject(s) - oled , materials science , optoelectronics , annealing (glass) , light emitting diode , layer (electronics) , junction temperature , power (physics) , composite material , physics , quantum mechanics

A “fuzzy-junction” organic light-emitting device (OLED) containing a graded organic–organic interface is reported. Such graded junction is effectively produced utilizing interdiffusion through an ultrathin interfacial fusing layer sandwiched between two functional layers. With a glass transition temperature (Tg) lower than remaining layers, this fusing layer permits smooth interdiffusion and mixing of neighboring layers by annealing above its Tg. With appropriate material combinations, fuzzy-junction OLEDs thus prepared exhibit both reduced voltage and enhanced emission efficiency in comparison with conventional abrupt-junction devices. As an instance, a green fluorescent OLED with such fuzzy junction shows a high peak power efficiency of ∼20 lm/W, substantially higher than ∼14 lm/W of a corresponding abrupt-junction device.

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