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4.2: Highly Efficient Top‐Emitting White Organic Electroluminescent Devices
Author(s) -
Hsu ShihFeng,
Hwang ShiaoWen,
Chen Chin H.
Publication year - 2005
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 - 10.1889/1.2720316
Subject(s) - electroluminescence , anode , cathode , chromaticity , materials science , oled , optoelectronics , white light , layer (electronics) , opacity , transparency (behavior) , color rendering index , electrode , optics , nanotechnology , chemistry , physics , computer science , computer security
We have developed highly efficient white top‐emitting organic light‐emitting devices (TOLEDs) with broad emission by modifying both anode and cathode. To alleviate the undesirable microcavity effect and obtain “broad” white emission, CF x ‐coated Ag anode with modified reflectivity and an index‐matching layer (SnO 2 ) capped on thin Ca/Ag cathode with a maximal transparency of 80% were employed. A top‐emitting broad white light device based on the dual layer architecture of light blue and yellow emitters with one of the highest EL efficiencies of 22.2 cd/A (9.6 lm/W) at 20 mA/cm 2 and 7.3 V with Commission Internationale d'Eclairage (CIE) coordinates of (x=.0.31, y=0.47) has been demonstrated.