TITLE

Tunable, narrow, and enhanced electroluminescent emission from porous-silicon-reflector-based organic microcavities

AUTHOR(S)
Qiu, X. J.; Tan, X. W.; Wang, Z.; Liu, G. Y.; Xiong, Z. H.
PUB. DATE
October 2006
SOURCE
Journal of Applied Physics;10/1/2006, Vol. 100 Issue 7, p074503
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Microcavity organic light-emitting diodes (MC-OLEDs) based on porous silicon distributed Bragg reflectors (PS-DBRs) have been realized, and improved structural, optical, and electrical properties have been observed. In the device, a multilayer OLED functions as the central active element, sandwiched between a top silver film and a bottom PS-DBR formed by electrochemical etching of a p++-Si substrate. Field-emission scanning-electron-microscopy cross-sectional images show that there exist nanoscale layered structures and flat interfaces inside the cavity. Widths of green and red electroluminescent (EL) peaks emitted from the MC-OLEDs are 8 and 12 nm, respectively, greatly reduced in comparison with 85 and 70 nm measured from noncavity structures. The narrowed EL emission from the MC-OLEDs is directional and in single mode, with off-resonant optical modes highly suppressed, which is mainly due to the good optical properties of PS-DBR with high reflectivity in a wide smooth stop band. Further increases in the green and red EL intensities by factors of about 6 and 4, respectively, are achievable. The improvement is physically attributable to the spatial redistribution of the photon density of states in the cavities. In addition, current-brightness-voltage properties and lifetime-related parameters of the devices are discussed. Such device structure and emission patterns of the MC-OLEDs should be useful in silicon compatible optical interconnects and light-emitting diode array printing.
ACCESSION #
22767554

 

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