N-Heteroacenes as an Organic Gain Medium for Room-Temperature Masers

The development offuture quantum devices such as the maser, i.e.,the microwave analog of the laser, could be well-served by the explorationof chemically tunable organic materials. Current iterations of room-temperatureorganic solid-state masers are composed of an inert host materialthat is doped with a spin-active molecule. In this work, we systematicallymodulated the structure of three nitrogen-substituted tetracene derivativesto augment their photoexcited spin dynamics and then evaluated theirpotential as novel maser gain media by optical, computational, andelectronic paramagnetic resonance (EPR) spectroscopy. To facilitatethese investigations, we adopted an organic glass former, 1,3,5-tri-(1-naphthyl)-benzeneto act as a universal host. These chemical modifications impactedthe rates of intersystem crossing, triplet spin polarization, tripletdecay, and spin-lattice relaxation, leading to significantconsequences on the conditions required to surpass the maser threshold.

Automated summary

This study systematically modulated the structure of three nitrogen-substituted tetracene derivatives to enhance their photoexcited spin dynamics and evaluated their potential as novel maser gain media through optical, computational, and electronic paramagnetic resonance spectroscopy. Chemical modifications affected the rates of intersystem crossing, triplet spin polarization, triplet decay, and spin-lattice relaxation, leading to significant consequences on the conditions required to exceed the maser threshold.