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Masers, the microwave analogue of lasers, promise to deliver ultra-low noiseamplification of microwave signals for use in medical MRI imaging anddeep-space communication. Research on masers in modern times was rekindledthanks to the discovery of gain media that were operable at room-temperature,eschewing bulky cryogenics that hindered their use. However, besides the twoknown materials of pentacene doped in para-terphenyl and negatively-chargednitrogen-vacancy defects in diamond, there has been scarce progress in thesearch for completely new room-temperature gain media. Here we show thediscovery of 6,13-diazapentacene doped in para-terphenyl as a maser gain mediumthat can operate at room-temperature and without an external magnetic field. Ameasured maser pulse power of -10 dBm shows it is on par with pentacene-dopedpara-terphenyl in absolute power, while possessing compelling advantagesagainst its pentacene predecessor in that it has a faster amplification startuptime, can be excited with longer wavelength light at 620 nm and enjoys greaterchemical stability from added nitrogen groups. Furthermore, we show that themaser bursts allow 6,13-diazapentacene-doped para-terphenyl to reach the strongcoupling regime for cavity quantum electrodynamics, where it has a highcooperativity of 182. We study the optical and microwave spin dynamics of6,13-diazapentacene-doped para-terphenyl in order to evaluate its behavior as amaser gain medium, where it features fast intersystem crossing and anadvantageously higher triplet quantum yield. Our results pave the way for thefuture discovery of other similar maser materials and help point to suchmaterials as promising candidates for the study of cavity quantumelectrodynamic effects at room-temperature.

Move aside pentacene: Diazapentacene doped para-terphenyl as a  zero-field room-temperature maser with strong coupling for cavity quantum  electrodynamics