講演情報
[8p-P07-3]Highly polarized Amplified Spontaneous Emission from a D–A–D Organic Dye in CBP-Host Blended Films
〇(M1)Hsin-Yi Wei1, Ja-Hon Lin1, Yu-Cheng Hou1, Yin-wen Lee1, Tzu-Chau Lin2, Chihaya Adachi3 (1.Natl. Taipei Univ. of Tech., 2.Natl. Cent. Univ., 3.Kyushu Univ.)
キーワード：
donor-acceptor-donor organic dye、amplified spontaneous emission、blended film
In this study, we investigate the polarization characteristics of amplified spontaneous emission (ASE) from blend films by doping a self-synthesized donor–acceptor–donor (D–A–D) structured organic dye, 2DFL-2Tp-PT-C6, into 4,4'-Bis(9H-carbazol-9-yl)biphenyl (CBP). The chromophore's molecular structure comprises a bis(4-methoxyphenyl)amino group and a 2-hexyl-2H-[1,2,3]triazolo[4,5-c]pyridine core, where the bis(4-methoxyphenyl)amino (diphenylamino) groups act as electron acceptors. The blend films were prepared by spin-coating a chloroform-based solution of the chromophore and CBP onto glass substrates. ASE and its polarization behavior were studied using a 337.1 nm nitrogen laser focused onto the sample through a cylindrical lens. Side-emission spectra were collected with a monochromator coupled to a CCD detector, and a linear polarizer was placed in front of the fiber tip to confirm ASE polarization. Due to the spectral overlap between CBP photoluminescence and chromophore absorption, efficient Förster resonance energy transfer (FRET) occurs, significantly reducing the ASE threshold in solid films. As the dye concentration decreases from 12.0 wt% to 3.0 wt%, the ASE threshold drops to a minimum of 7.03 uJ cm^(-2), attributed to improved film quality and reduced light scattering. Moreover, the highly polarized ASE with a degree of polarization (DOP) around 93.4% is attributed to the gain-guiding effect.