29.3: Very Bright and Efficient Top‐Emitting OLED with Ultra‐Thin Yb as Effective Electron Injector | Zendy

Zhu X. L. | Zendy; Sun J. X. | Zendy; Yu X. M. | Zendy; Wong M. | Zendy; Kwok H. S. | Zendy

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29.3: Very Bright and Efficient Top‐Emitting OLED with Ultra‐Thin Yb as Effective Electron Injector

Author(s) -

Zhu X. L.,

Sun J. X.,

Yu X. M.,

Wong M.,

Kwok H. S.

Publication year - 2006

Publication title -

sid symposium digest of technical papers

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.351

H-Index - 44

eISSN - 2168-0159

pISSN - 0097-966X

DOI - 10.1889/1.2433217

Subject(s) - cathode , oled , iridium , materials science , dopant , ytterbium , diode , optoelectronics , phosphorescence , electron , layer (electronics) , electrical efficiency , injector , doping , optics , chemistry , power (physics) , nanotechnology , physics , organic chemistry , quantum mechanics , fluorescence , catalysis , thermodynamics

Very bright and efficient top‐emitting organic light‐emitting diodes (TOLEDs) using an ultra‐thin ytterbium (Yb) layer capped with a semitransparent Ag layer as the effective electron‐injection cathode were demonstrated. TOLED with Yb/Ag cathode exhibited lower operation voltage and higher power efficiency, as compared to the one with commonly used Ca/Ag cathode. With bis(2‐phenylpyridine)iridium [(ppy) 2 Ir(acac)] as the phosphorescent dopant, the Yb/Ag based TOLED showed a current efficiency of 88 cd/A and a power efficiency of 67 lm/W, considerably greater than those (56 cd/A and 44 lm/W) obtained from the corresponding bottom‐emitting one. The good performance of these TOLEDs is attributed to the efficient electrons injection from the Yb/Ag cathode as well as a micro‐cavity effect.

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