Kyung Hee University · Engineering
Professor Kenkera Rayappa Naveen's research lab specializes in the design and development of advanced organic semiconductors for next-generation optoelectronic devices, with a primary focus on thermally activated delayed fluorescence (TADF) emitters. The lab pioneers the synthesis of boron-based multi-resonance TADF materials—particularly double boron-embedded systems—aimed at achieving narrowband, high-efficiency emission across the full color spectrum, including pure blue and red. Their work emphasizes molecular engineering to control frontier orbital distributions, enhance photoluminescence quantum yields, and enable hyperfluorescence architectures for high-color-purity displays. The lab also explores scalable synthetic routes to facilitate practical applications in OLEDs.
Figures are computed from collected data and may differ slightly.
Abstract The subclass of multi resonant thermally activated delayed fluorescent emitters ( MR-TADF ) containing boron atoms has garnered significant attention in the field of organic light emitting diode (OLED) research. Among boron-based MR-TADF emitters, double boron-embedded MR-TADF ( DB-MR-TADF ) emitters show excellent electroluminescence performances with high photoluminescence quantum yields, narrow band emission, and beneficially small singlet-triplet energy levels in all the full-color
The hunt for narrow-band emissive pure organic molecules capable of harvesting both singlet and triplet excitons for light emission has garnered enormous attention to promote the advancement of organic light-emitting diodes (OLEDs). Over the past decade, organic thermally activated delayed fluorescence (TADF) materials based on donor (D)/acceptor (A) combinations have been researched for OLEDs in wide color gamut (RGB) regions. However, due to the strong intramolecular charge-transfer (CT) state
Abstract In the field of organic light‐emitting diodes, organo‐boron based thermally activated delayed fluorescence (TADF) emitters have witnessed outstanding achievements. However, it is still challenging to achieve pure blue color (CIE y < 0.20) along with high efficiencies. To overcome these hurdles, the hyperfluorescence (HF) system suggests a key strategy for future display applications. Here, two TADF host materials, p MDBA‐DI and m MDBA‐DI, and a pure blue multi‐resonance type tert‐but
Developing double boron-based emitters with extremely narrow band spectrum and high efficiency in organic light-emitting diodes (OLEDs) is crucial and challenging. Herein, we report two materials, NO-DBMR and Cz-DBMR, hinge on polycyclic heteraborin skeletons based on role-play of the highest occupied molecular orbital (HOMO) energy levels. The NO-DBMR contains an oxygen atom, whereas the Cz-DBMR has a carbazole core in the double boron-embedded ν-DABNA structure. The synthesized materials resul
Abstract Developing boron‐based emitters in red region with a narrow band spectrum is crucial and challenging for optoelectronic applications. Herein the authors report novel emitters with reasonable multiple resonance (MR) effect by utilizing a CC bond type connection instead of conventional CN bond. The designed emitters BP‐2DPA and DBP‐4DPA exhibit narrowband pure red emissions with photoluminescence (PL) maxima of 599, 605 nm with a full width half maximum (FWHM) of 34 nm and high PL quant
Pure organic molecules based thermally activated delayed fluorescence (TADF) emitters have been successfully developed in recent years for their propitious application in highly efficient organic light emitting diodes (OLEDs). In the case of orange red emitters, the non-radiative process is known to be a serious issue due to its lower lying singlet energy level. However, recent studies indicate that there are tremendous efforts put to develop efficient orange red TADF emitters. In addition, the
Since their first demonstration, thermally activated delayed fluorescence (TADF) materials have been emerged as the most promising emitters because of their promising applications in optoelectronics, typified by organic light-emitting diodes (OLEDs). In which, the rigid oxygen bridged boron acceptor-featured (DOBNA) emitters have gained tremendous impetus for OLEDs, which is ascribed to their excellent external quantum efficiency (EQE). However, these materials often displayed severe efficiency
Thermally activated delayed fluorescent (TADF) materials shown great attention in Organic light-emitting diodes (OLEDs). Herein, we have systematically reviewed the Acceptor–Donor–Acceptor based TADF materials with electroluminescent characteristics.
Abstract Developing double boron‐based emitters with extremely narrow band spectrum and high efficiency in organic light‐emitting diodes (OLEDs) is crucial and challenging. Herein, we report two materials, NO‐DBMR and Cz‐DBMR , hinge on polycyclic heteraborin skeletons based on role‐play of the highest occupied molecular orbital (HOMO) energy levels. The NO‐DBMR contains an oxygen atom, whereas the Cz‐DBMR has a carbazole core in the double boron‐embedded ν‐DABNA structure. The synthesized mater
Abstract In the field of organic light emitting diodes (OLEDs), organo-boron based thermally activated delayed fluorescence (TADF) emitters have reached great achievement. However, it is still challenging to achieve pure blue color (CIE y < 0.20) along with high efficiencies. To overcome these hurdles, hyperfluorescence (HF) suggest a key strategy in future OLED applications. Here, we report two TADF materials, p MDBA-DI and m MDBA-DI. Further, a pure blue multi resonance type tert -butyl sub
orange red TADF emitters consist of rigid donor and acceptor moieties exhibit excellent device efficiencies. However, achieving high color purity in orange red region is hindered due to strong charge-transfer characteristics of donor–acceptor-type emitters. To overcome such issues, multi-resonance type emitters are proposed, and it shows high color purity along with good efficiencies in orange red organic light emitting diodes. As an alternative to the conventional system, hyper-fluorescence org
We report three deep blue multiple resonant TADF emitters, m‐ν‐DABNA, 4F‐ν‐DABNA, and 4F‐m‐ν‐DABNA by incorporating methyl groups and fluorine atoms in diboron based ν‐DABNA core. The introduction of methyl groups and fluorine atoms resulted in bandgap enhancement by electron donating and electron withdrawing effects. All three emitter's exhibit pure blue emissions with high photoluminescence quantum yield around ~90%, small ΔE ST (≤ 0.07 eV) values, and fast reverse intersystem crossing rate (k
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