Hybridized Local and Charge-Transfer Excited-State Emitter for a Blue Organic Solid-State Laser.

Area of Science:

• Organic electronics
• Materials science
• Photonics

Background:

• Efficient exciton utilization is crucial for organic semiconductor laser diodes.
• Triplet exciton harvesting and short exciton lifetimes are key parameters.
• Hybridized local and charge-transfer (HLCT) emitters offer potential for advanced optoelectronic devices.

Purpose of the Study:

• To investigate the potential of a novel HLCT-type molecule as an emitter for blue-emitting organic solid-state lasers (OSSLs).
• To evaluate the performance of the PhAnMBf emitter in OSSLs, focusing on emission characteristics and threshold.
• To demonstrate the viability of anthracene-based HLCT materials for laser applications.

Main Methods:

• Synthesis and characterization of the HLCT-type molecule, 11-(3-(10-(4-(1-phenyl-1H-phenanthro[9,10-d]imidazol-2-yl)phenyl)anthracen-9-yl)phenyl)-11H-benzofuro[3,2-b]carbazole (PhAnMBf).
• Fabrication of an organic laser device using PhAnMBf as the active emitter on a distributed feedback substrate.
• Optical characterization of the fabricated OSSL, including emission wavelength, spectral width, and lasing threshold measurement.

Main Results:

• The PhAnMBf emitter exhibited a short exciton lifetime and high photoluminescence quantum yield.
• An OSSL was successfully fabricated, emitting at a wavelength of 453 nm with a narrow spectral width (FWHM) of 1.2 nm.
• The OSSL demonstrated a low threshold energy of 105 nJ/pulse (44 μJ/cm²).

Conclusions:

• The anthracene-based PhAnMBf material is a promising candidate for blue-emitting OSSLs.
• HLCT emitters can effectively improve exciton utilization in organic lasers.
• This study highlights the potential of designing advanced organic materials for efficient solid-state laser applications.