Triplet exciton accumulation and singlet-triplet annihilation (STA) are major issues, which makes continuous-wave (CW) operation difficult, in organic lasers. We synthesized an organic laser dye, 2,6-dicyano-1,1-diphenyl-λ5σ4-phosphinine (DCNP), having a small singlet-triplet energy gap. In DCNP-doped 4-4΄-bis[(N-carbazole)styryl] biphenyl (BSBCz) films, the triplets formed on DCNP are easily transferred to BSBCz, resulting in the suppressed STA and triplet accumulation. With this system, we demonstrated true-CW laser operation, with a low threshold and high photostability. Laser emission was further characterized by plane-polarized light output, far-field beam interference, exciton decay lifetime, and visible beam observed on an illuminance paper.
A novel solution processable organic semiconductor dye, 9,9'-(((1E,1'E)-(9,9-dihexyl-9H-fluorene-2,7-diyl)bis(ethene-2,1-diyl))bis(4,1-phenylene))bis(9H-carbazole) (BSFCz) was synthesized and investigated in terms of its amplified spontaneous emission (ASE) and surface emission laser properties under optical excitation. Films of BSFCz, which were blended with tris(4-carbazoyl-9-ylphenyl)amine (TCTA) at 6 wt.% with solution processing, had a low ASE threshold of 1.1 μJ cm−2 and surface emission laser threshold of 0.9 μJ cm−2 with second-order distributed feedback structure. Moreover, our BSFCz-based devices exhibited quasi-continuous-wave lasing with good stability up to 10 ms. To the best of our knowledge, this is the first ever demonstration of solution-processed organic lasers, which can work under the quasi-continuous wave regime.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.