02242nas a2200241   4500008004100000022001400041245017400055210006900229260000800298300001400306490000700320520136100327653002301688653002201711653002001733653002601753653001301779653002601792100001501818700002301833700001401856856013001870       2017                        eng d  a0897-475600aEfficient exciton to dopant energy transfer in Mn2+-Doped (C<inf>4</inf>H<inf>9</inf>NH<inf>3</inf>)<inf>2</inf>PbBr<inf>4</inf> two-dimensional (2D) layered perovskites0 aEfficient exciton to dopant energy transfer in Mn2Doped Cinf4inf  cSEP  a7816-78250 v293 aThree-dimensional ABX3 perovskite material has attracted immense interest and applications in optoelectronic devices, because of their enabling properties. Recently, Mn2+ doping directly into APbCl3-type three-dimensional (3D) nanocrystals, manifesting host-to-dopant energy transfer, have been reported for LED display applications. Strongly bound excitons in the doped system can enhance the dopant-carrier exchange interactions, leading to efficient energy transfer. Here, we report the simple and scalable synthesis of Mn2+-doped (C4H9NH3)2PbBr4 two-dimensional (2D) layered perovskites. The Mn2+-doped 2D perovskite shows enhanced energy transfer efficiency from the strongly bound excitons of the host material to the d electrons of Mn2+ ions, resulting in intense orange-yellow emission, which is due to spin-forbidden internal transition (4T1 → 6A1) with the highest quantum yield (Mn2+) of 37%. Because of this high quantum yield, stability in ambient atmosphere, and simplicity and scalability of the synthetic procedure, Mn2+-doped 2D perovskites could be beneficial as color-converting phosphor material and as energy down-shift coating for perovskite solar cells. The newly developed Mn2+-doped 2D perovskites can be a suitable material to tune dopant-exciton exchange interactions to further explore their magneto-optoelectronic properties.10aDoping (additives)10aEnergy Efficiency10aEnergy Transfer10aExchange interactions10aExcitons10aLight Emitting Diodes1 aBiswas, A.1 aBakthavatsalam, R.1 aKundu, J.  uhttp://library.ncl.res.in/content/efficient-exciton-dopant-energy-transfer-mn2-doped-c4h9nh32pbbr4-two-dimensional-2d-layered02053nas a2200265   4500008004100000245013800041210006900179260000800248300001400256490000800270520118500278653002001463653001701483653001501500653001201515100001601527700001701543700001301560700001301573700001901586700001701605700001601622700001801638856013101656       2017                        eng d00aMulticolour and nearly white light emission in YP<inf>0.8</inf>V<inf>0.2</inf>O<inf>4</inf>:Sm3+ nanorods: controlled energy transfer0 aMulticolour and nearly white light emission in YPinf08infVinf02i  cDEC  a1161-11670 v7263 aNanorods of YP0.8V0.2O4:Sm³⁺ have been synthesized under hydrothermal conditions. Substitution of vanadium (V⁵⁺) sites in YVO4 by phosphorus ions (P⁵⁺) has been confirmed by Fourier transform infrared spectroscopy, X-ray diffraction and transmission electron microscopy. Careful selection of Sm³⁺ concentration in YP0.8V0.2O4 enables to achieve the controlled energy transfer from the VO4³⁻ absorption to the excited states of Sm³⁺ ions. The controlled energy transfer has been confirmed from the steady state luminescence and decay lifetime studies of VO4³⁻ emission. With the controlled retention of VO4³⁻ emission, tuning of light emission from the singly (Sm³⁺) doped YP0.8V0.2O4 nanorods is realized. At a particular doping concentration of Sm³⁺ (1.25 at.%), a nearly white light emission is observed. The quantum yield of this nearly white light emission is found to be ∼28%. Tunability of the light and white light emission are supported by CIE chromaticity. The energy transfer efficiency from the VO4³⁻ absorption to the excited states of Sm³⁺ ion in YP0.8V0.2O4 reaches upto ∼86% with the doping concentration of 2.25 at.%. 

10aEnergy Transfer10aLuminescence10aMulticolor10aNanorod1 aSingh, N.S.1 aWangkhem, R.1 aYaba, T.1 aDevi, S.1 aLuwang, M., N.1 aYaiphaba, N.1 aDevi, H., S1 aSingh, T., D.  uhttp://library.ncl.res.in/content/multicolour-and-nearly-white-light-emission-yp08v02o4sm3-nanorods-controlled-energy-transfer02176nas a2200253   4500008004100000022001400041245011800055210006900173260000800242490000700250520127800257653002001535653001901555653003301574653001401607653001601621100003301637700002901670700002601699700001801725700002201743700003001765856012701795       2023                        eng d  a1433-785100aPolymerizable solvent-free organic liquids: a new approach for large area flexible and foldable luminescent films0 aPolymerizable solventfree organic liquids a new approach for lar  cAUG0 v623 a<p>The high demand for light-emitting and display devices made luminescent organic materials as attractive candidates. Solvent-free organic liquids are one of the promising emitters among them due to the salient features. However, the inherent limitations of forming sticky and noncurable surfaces must be addressed to become an alternate emitter for large-area device applications. Herein, we functionalized solvent-free organic liquids having monomeric emission in bulk with polymerizable groups to improve the processability. The polymerizable group on carbazole, naphthalene monoimide, and diketopyrrolopyrrole-based solvent-free liquid emitters enabled on-surface polymerization. These emitters alone and in combinations can be directly coated on a glass substrate without the help of solvents. Subsequent photo or thermal polymerization leads to stable, non-sticky, flexible, foldable, and free-standing large-area films with reasonably high quantum yield. Our demonstration of the tunable and white light-emitting films using polymerizable solvent-free liquids might be a potential candidate in flexible/foldable/stretchable electronics. The new concept of polymerizable liquid can be extended to other functional features suitable for futuristic applications.</p>
10aEnergy Transfer10apolymerization10aSolvent-Free Organic Liquids10aThin-Film10aWhite Light1 aWakchaure, Vivek, Chandrakan1 aVeer, Sairam, Dnyaneshwa1 aNidhankar, Aakash, D.1 aKumar, Viksit1 aNarayanan, Aswini1 aBabu, Sukumaran, Santhosh  uhttp://library.ncl.res.in/content/polymerizable-solvent-free-organic-liquids-new-approach-large-area-flexible-and-foldable02131nas a2200301   4500008004100000022001400041245011400055210006900169260000900238490000700247520111200254653001601366653002001382653000901402653002001411653000901431100002901440700001801469700002901487700002401516700002901540700002501569700001801594700002501612700003101637700003001668856013101698       2023                        eng d  a1861-472800aThermally activated delayed fluorescent solvent-free organic liquid hybrids for tunable emission applications0 aThermally activated delayed fluorescent solventfree organic liqu  cJUL 0 v183 a<p>
	The synthetic feasibility and excellent luminescence features of organic molecules attracted much attention and were eventually found useful in lighting applications. In this context, a solvent-free organic liquid having attractive thermally activated delayed fluorescence features in bulk along with high processability has prime importance. Herein, we report a series of naphthalene monoimide-based solvent-free organic liquids exhibiting cyan to red thermally activated delayed fluorescence with luminescence quantum yields up to 80% and lifetimes between 10 to 45 mu s. An effective approach explored energy transfer between liquid donors with various emitters exhibiting tunable emission colors, including white. The high processability of liquid emitters improved the compatibility with polylactic acid and was used for developing multicolor emissive objects using 3D printing. Our demonstration of the thermally activated delayed fluorescence liquid will be much appreciated as a processable alternate emissive material suitable for large-area lighting, display, and related applications.</p>
10a3D printing10aEnergy Transfer10aOLED10aOrganic Liquids10aTADF1 aNidhankar, Aakash, D. D.1 aGoudappagouda1 aKothavade, Premkumar, D.1 aDongre, Sangram, D.1 aVeer, Sairam, Dnyaneshwa1 aDash, Soumya, Ranjan1 aRajeev, Kavya1 aUnni, K., N. Narayan1 aShanmuganathan, Kadhiravan1 aBabu, Sukumaran, Santhosh  uhttp://library.ncl.res.in/content/thermally-activated-delayed-fluorescent-solvent-free-organic-liquid-hybrids-tunable-emission