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Organic Phosphorescence Nanowire Lasers.
Zhenyi Yu1,2,3, Yishi Wu2, Lu Xiao2,3
1Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Department of Chemistry, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) , Tianjin 300072, People's Republic of China.
Researchers developed the first organic solid-state laser (OSSL) using triplet phosphorescence. This breakthrough utilizes a novel nanowire microcavity, overcoming previous limitations in triplet lasing for advanced light source applications.
Area of Science:
- Materials Science
- Optoelectronics
- Organic Chemistry
Background:
- Organic solid-state lasers (OSSLs) typically rely on singlet fluorescence.
- Triplet phosphorescence offers high internal quantum efficiency in organic light-emitting diodes (OLEDs) but faces challenges in lasing due to inefficient intersystem crossing (ISC) and low phosphorescence quantum yield (ΦP).
Purpose of the Study:
- To report the first triplet-phosphorescence OSSL.
- To investigate a novel sulfide-substituted difluoroboron compound for efficient triplet lasing.
Main Methods:
- Fabrication of a nanowire microcavity using a sulfide-substituted difluoroboron compound.
- Characterization of photophysical properties, including intersystem crossing (ISC) efficiency and phosphorescence quantum yield (ΦP).
- Demonstration of lasing emission under pulsed excitation within the nanowire Fabry-Perot microcavity.
Main Results:
- Achieved 100% efficient T1 (π,π*) ← S1 (n,π*) intersystem crossing (ΦISC = 100%) and a moderate phosphorescence quantum yield (ΦP = 10%) in the sulfide-substituted compound.
- Successfully demonstrated triplet-phosphorescence OSSL emission at 650 nm.
- The nanowire microcavity provided essential optical feedback for lasing.
Conclusions:
- This work presents the first successful triplet-phosphorescence OSSL.
- The developed material and microcavity design overcome key limitations in triplet lasing.
- Opens possibilities for a new class of laser materials based on triplet phosphors.
