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Proceedings Paper

Lasing characteristics of optically pumped edge-emitting organic semiconductor laser with 4,4'-bis[(N-carbazolyl)styryl] biphenyl
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Paper Abstract

Recently, we have presented optically-pumped edge-emitting organic laser devices consisting of Alq3:DCM film (5% DCM) deposited onto a polished GaAs (100) substrate coated with an 1-um-thick layer of RF sputtered SiO2 using cleaving method. The threshold density was typically 3 μJ/cm2 in a sample with a cavity length of 5 mm. The internal loss α and the gain coefficient β were found to be about 10.5 cm-1 and 3.2 cm-μJ-1, respectively. BSB-Cz has quite-high efficiency as blue laser material. In this work, organic laser devices of CBP:BSB-Cz film (6% BSB-Cz) were vacuum-deposited onto a polished GaAs (100) substrate coated with an 1 um-thick layer of RF sputtered SiO2. The cleaved samples were optically pumped by a N2 gas laser (wavelength: 337 nm) with a pulse width of 600 ps at a repetition rate of 20 Hz. We investigated emission spectrum, emission intensity and the full width at half maximum (FWHM) by varying excitation intensity. Pumping a sample with a cavity-length of 5 mm, emission intensity drastically increased at certain. The FWHM drastically narrowed as the emission intensity was increased. The threshold density was 1.40 μJ/cm2 with a cavity length of 5 mm, it was half as much as Alq3:DCM. The internal loss α and the gain coefficient β were found to be about 5.57 cm-1 and 6.72 cm-μJ-1. We found BSB-Cz material have higher efficiency than Alq3:DCM. Moreover, polarization characteristics. And the threshold density cavity length relationship were investigated.

Paper Details

Date Published: 27 August 2009
PDF: 11 pages
Proc. SPIE 7415, Organic Light Emitting Materials and Devices XIII, 74151H (27 August 2009); doi: 10.1117/12.825451
Show Author Affiliations
Kenji Shirakawa, Keio Univ. (Japan)
Hiroki Yamaoka, Keio Univ. (Japan)
Yasuhiro Toriyama, Keio Univ. (Japan)
N. Shinichi Takahashi, Keio Univ. (Japan)
Chihaya Adachi, Kyushu Univ. (Japan)


Published in SPIE Proceedings Vol. 7415:
Organic Light Emitting Materials and Devices XIII
Franky So; Chihaya Adachi, Editor(s)

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