Phenoxazine and phenothiazine embedded Multi-Resonance emitters for highly efficient Pure-Red OLEDs with improved color purity

Marching Toward Long‐Wavelength Narrowband Emissive Multi‐Resonance Delayed Fluorescence Emitters for Organic Light Emitting Diodes

“…Most recently, same group reported two new red MR-TADF emitters by arranging three N and one O into the double Bembedded PAH framework, RBNO1 and RBNO2. [92] As expected, these emitters exhibited red-shifted emission compared to the BNO series because of the increased 𝜋-extension and strong SRCT. The RBNO1 and RBNO2 showed pure red emission with narrow FWHM, 𝜆 PL /FWHM = 631/39 nm and 645/39 nm, respectively.…”

“…[141] 4) Another interesting strategy is metal-perturbation into the MR-core; by introducing metals such as Au and Pt, the SOC for the ISC and RISC significantly improved; [142][143][144] which is one of the feasible solution to boost the RISC of MR-TADF emitters without compromising color purity; 5) From device engineering point of view, employing the MR-emitter as terminal dopant in sensitized device structure is advantageous for suppressing the triplet exciton quenching, leading to the reduced efficiency roll-off and improved operation stability. [90][91][92] For improving the RISC of longwavelength emitters with high color purity, we believe that the integration of multiple design strategies such as para-N-𝜋-N and para-B-𝜋-B, heavy atom incorporation and 𝜋-extension together in one molecular design is ideal.…”

Recent Advances in Monocomponent Visible Light Photoinitiating Systems Based on Sulfonium Salts

“…Indeed, phenothiazine is a polyaromatic structure absorbing in the visible range, even without substituents, so that various Type I and Type II photoinitiators were designed and synthesized with this structure [191][192][193][194][195][196][197]. This is also an excellent electron donor that was extensively used for the design of push-pull dyes developed for different applications in organic electronics such as energy conversion [198][199][200][201][202][203][204][205][206][207][208][209][210], light-emitting materials for organic light-emitting diodes (OLEDs) [211][212][213][214][215][216][217][218][219][220][221][222][223] or semi-conductors for organic field effect transistors (OFETs) [199,[224][225][226][227][228][229]. Phenothiazines were also developed as fluorescent probes for the detection of various molecules and ions in organic and aqueous solutions, food, live cells and animals [230][231][232]…”

Recent advances on phenothiazine-based oxime esters as visible light photoinitiators of polymerization

“…[113][114][115][116][117][118] Numerous drugs have also been prepared with the phenothiazine scaffold as exemplified with thioridazine, chlorpromazine, fluphenazine, perphenazine, prochlorperazine and others biologically active products. [119] Similarly to carbazole, phenothiazine is also an excellent electron-donating group and this group was extensively used for the design of chromophore for solar cells, [120][121][122][123][124][125][126][127], light-emitting materials for electroluminescent devices, [128][129][130][131][132] semiconductors for organic field effect transistors (OFETs) [133][134][135][136][137][138] or fluorescent probes. [139][140][141][142] Based on these strong knowledges concerning phenothiazine chemistry, a wide range of phenothiazine-based oxime esters were designed and synthesized starting from 2017.…”