Title Multifunctionality of quinoxaline derivatives with variable room temperature phosphorescence for luminescent tags, morphological imaging, single-emitter white OLEDs, and highly sensitive oxygen sensors
Authors Abdella, Mohamed ; Guzauskas, Matas ; Simokaitiene, Jurate ; Dabuliene, Asta ; Cekaviciute, Monika ; Volyniuk, Dmytro ; Matulis, Vitaly E ; Ragoyja, Ekaterina G ; Grazulevicius, Juozas V
DOI 10.1016/j.rineng.2026.109560
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Is Part of Results in engineering.. Amsterdam : Elsevier. 2026, vol. 29, art. no. 109560, p. 1-14.. ISSN 2590-1230
Keywords [eng] Luminescent tag ; Oxygen sensor ; Quinoxaline ; Room temperature phosphorescence ; Single-emitter white organic light-emitting diode
Abstract [eng] The impact of room temperature phosphorescence (RTP) of the derivatives of quinoxaline derivatives on their multifunctional properties is investigated for the estimation of applicability in luminescent tags, morphological imaging, single-emitter white organic light-emitting diodes (OLEDs), and oxygen sensors. The differences in the phosphorescence spectra of the compounds are attributed to their electronic structure. The molecular dispersions in the rigid polymer matrix of the quinoxaline derivatives with either rigid or flexible molecular structures, with or without bromine atoms, show green to orange RTP with quantum yields of up to 45.6 % and RTP lifetimes from 0.83 to 525 ms. The extremely high ratio of RTP to fluorescence quantum yields, reaching 910, is observed for the molecular mixtures of the quinoxaline derivatives with the polymeric host. This property enables the use of quinoxaline derivatives as the state-of-the-art active materials for luminescence tags or morphological imaging. OLEDs with the emitting layers of the quinoxaline derivatives molecularly dispersed in a charge-transporting host, exhibit the combination of blue fluorescence and orange RTP resulting in white electroluminescence with CIE1931 coordinates (x, y) ranging from (0.32–0.41, 0.31–0.45) and colour rendering indexes between 71 and 83. Due to efficient RTP, the studied quinoxaline derivatives are ideally suited for oxygen sensors. The high oxygen sensitivity of one synthesized RTP emitter with the emission lifetime of 525 ms enables to reach the Stern-Volmer constants of up to 1.1 × 10⁻³ ppm⁻¹ which is among the highest ones reported up to now.
Published Amsterdam : Elsevier
Type Journal article
Language English
Publication date 2026
CC license CC license description