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Indian Journal of Pure & Applied Physics (IJPAP) >
IJPAP Vol.43 [2005] >
IJPAP Vol.43(07) [July 2005] >
| Title: | Bright-blue organic electroluminescent device based on bis (2-methyl 8-quinolinolato) (triphenyl siloxy) aluminium |
| Authors: | Misra, Aparna
Kumar, Pankaj
Dhawan, S K
Kamalasanan, M N
Chandra, Subhas |
| Keywords: | OLEDs
SAlq
Electroluminescence
Photoluminescence
Blue emission |
| Issue Date: | Jul-2005 |
| Publisher: | CSIR |
| IPC Code: | G01J3/00 |
| Abstract: | An organic-luminescent material bis (2-methyl
8-quinolinolato) (triphenyl siloxy) aluminium (III) (SAlq) was synthesized and
its electrical and optical properties were studied. The material exhibited high
photoluminescence (PL) and electroluminescence (EL). Photoluminescence (PL)
spectra recorded at room temperature revealed a broad blue emission peak at 490
nm along with a shoulder at 448 nm. The material was characterized by
UV-visible, photoluminescence, electroluminescence and IR spectroscopic
methods. The thermal stability of the material was determined using Thermo
Gravimetric Analysis (TGA), which suggests that the material is thermally
stable up to 300 oC. Using the Tauc relation and the absorbance
cut-off wavelength at 410 nm, the optical band gap of the material was
evaluated to be 3.1 eV. OLEDs were fabricated in the configuration
ITO/TPD/SAlq/LiF/Al. The CIE chromaticity was also studied and the coordinates
were found to be independent of operating voltage. The devices show typical
non-linear diode I-V characteristics under forward bias
with the threshold voltage of 5 V. |
| Page(s): | 522-526 |
| ISSN: | 0975-1041 (Online); 0019-5596 (Print) |
| Source: | IJPAP Vol.43(07) [July 2005]
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