Polarized Species in an Organic Semiconductor Laser

Meeting the challenge of direct electrically driven organic
semiconductor
lasers (OSLs), the design of OSL materials is being studied. Polarized
species generally exist in conjugated organic materials and play an
important role in the photophysics procedure; therefore, understanding
these species is beneficial for designing novel OSL materials. Here,
we use the amplified spontaneous emission effect as a medium to reveal
a carbazole-benzothiadiazole-based polarized species induced by a
charge transfer process. Spectroscopic analysis confirms that this
polarized species that acted as a CT pair defect has a negative influence
on the ASE stability and solid state fluorescent quantum yield. This
inspires us to be cautious in terms of some specific molecular group
combinations when designing OSL materials.