• Behera, Sinay Simanta
• Ghorai, Anaranya
• Nair, Rajesh V.
• George, Subi J.
• Narayan, K. S.
• Garain, Swadhin

Abstract

<jats:title>Abstract</jats:title><jats:p>Triplet state modification in organic phosphorescence molecules for a desired color and quantum yield is typically pursued by chemical modification. A facile methodology is introduced to tune the triplet state dynamics of a phosphorescent molecule by changing the host‐matrix parameters. An organic phosphor, Br<jats:sub>2</jats:sub>PmDI (2–Bromo pyromellitic diimide), dispersed at dilute levels (1.5 wt.%) in a semicrystalline high‐<jats:italic>κ</jats:italic> relaxer ferroelectric host matrix emit room‐temperature phosphorescence accompanied by a delayed fluorescence component. The host relaxer ferroelectric polymer film can be engineered to form a photonic matrix with a regular micropore structure of refractive index contrast ≈0.6 that can increase the density of optical states and introduce photonic coupling. The phosphorescence quantum yield of Br<jats:sub>2</jats:sub>PmDI in this photonic matrix increases by ≈2.3 fold, and the lifetime reduces by a factor of three. The coupled quantum states are investigated by time‐resolved spectroscopy at different temperatures and pump intensities.</jats:p>

Topics

• density
• impedance spectroscopy
• polymer
• semicrystalline
• phosphorescence