Carbazole&benzoindole-based purely organic phosphors: a comprehensive phosphorescence mechanism, tunable lifetime and an advanced encryption system

2021 ◽  
Author(s):  
Chen Qian ◽  
Zhimin Ma ◽  
Bingxin Yang ◽  
Xianjiang Li ◽  
Jiayao Sun ◽  
...  
Keyword(s):  
Phosphorescence Lifetime ◽  
Organic Phosphors

The same molecule synthesized from different carbazoles may show various properties, which originate from the trace isomer in purchased carbazole. By changing the content of isomers, the phosphorescence lifetime can be quantitatively adjusted.

scholarly journals Ultraviolet irradiation-responsive dynamic ultralong organic phosphorescence in polymeric systems

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Yongfeng Zhang ◽  
Liang Gao ◽  
Xian Zheng ◽  
Zhonghao Wang ◽  
Chaolong Yang ◽  
...  
Keyword(s):  
Ultraviolet Irradiation ◽  
Screen Printing ◽  
Amorphous State ◽  
Poly Vinyl Alcohol ◽  
Ambient Conditions ◽  
Phosphorescence Lifetime ◽  
Polymeric Systems ◽  
Stimulus Responsive ◽  
Irradiation Period ◽  
Organic Phosphors

AbstractRoom temperature phosphorescence (RTP) has drawn extensive attention in recent years. Efficient stimulus-responsive phosphorescent organic materials are attractive, but are extremely rare because of unclear design principles and intrinsically spin-forbidden intersystem crossing. Herein, we present a feasible and facile strategy to achieve ultraviolet irradiation-responsive ultralong RTP (IRRTP) of some simple organic phosphors by doping into amorphous poly(vinyl alcohol) matrix. In addition to the observed green and yellow afterglow emission with distinct irradiation-enhanced phosphorescence, the phosphorescence lifetime can be tuned by varying the irradiation period of 254 nm light. Significantly, the dynamic phosphorescence lifetime could be increased 14.3 folds from 58.03 ms to 828.81 ms in one of the obtained hybrid films after irradiation for 45 min under ambient conditions. As such, the application in polychromatic screen printing and multilevel information encryption is demonstrated. The extraordinary IRRTP in the amorphous state endows these systems with a highly promising potential for smart flexible luminescent materials and sensors with dynamically controlled phosphorescence.

scholarly journals Biocompatible Ir(III) Complexes as Oxygen Sensors for Phosphorescence Lifetime Imaging

Molecules ◽  
2021 ◽  
Vol 26 (10) ◽  
pp. 2898
Author(s):  
Ilya S. Kritchenkov ◽  
Anastasia I. Solomatina ◽  
Daria O. Kozina ◽  
Vitaly V. Porsev ◽  
Victor V. Sokolov ◽  
...  
Keyword(s):  
Near Infrared ◽  
Biological Systems ◽  
Aqueous Media ◽  
Oxygen Sensors ◽  
Quantum Yields ◽  
Complete Agreement ◽  
Phosphorescence Lifetime ◽  
Lifetime Imaging ◽  
Nir Emission ◽  
Phosphorescence Lifetime Imaging

Synthesis of biocompatible near infrared phosphorescent complexes and their application in bioimaging as triplet oxygen sensors in live systems are still challenging areas of organometallic chemistry. We have designed and synthetized four novel iridium [Ir(N^C)2(N^N)]+ complexes (N^C–benzothienyl-phenanthridine based cyclometalated ligand; N^N–pyridin-phenanthroimidazol diimine chelate), decorated with oligo(ethylene glycol) groups to impart these emitters’ solubility in aqueous media, biocompatibility, and to shield them from interaction with bio-environment. These substances were fully characterized using NMR spectroscopy and ESI mass-spectrometry. The complexes exhibited excitation close to the biological “window of transparency”, NIR emission at 730 nm, and quantum yields up to 12% in water. The compounds with higher degree of the chromophore shielding possess low toxicity, bleaching stability, absence of sensitivity to variations of pH, serum, and complex concentrations. The properties of these probes as oxygen sensors for biological systems have been studied by using phosphorescence lifetime imaging experiments in different cell cultures. The results showed essential lifetime response onto variations in oxygen concentration (2.0–2.3 μs under normoxia and 2.8–3.0 μs under hypoxia conditions) in complete agreement with the calibration curves obtained “in cuvette”. The data obtained indicate that these emitters can be used as semi-quantitative oxygen sensors in biological systems.

Cation size dependence of phosphorescence lifetime of Eu2+ doped alkali halide crystals

2013 ◽  
Vol 35 (3) ◽  
pp. 617-619
Author(s):  
R. Pérez-Salas ◽  
T.M. Piters ◽  
R. Aceves ◽  
R. Rodríguez-Mijangos ◽  
H. Riveros ◽  
...  
Keyword(s):  
Alkali Halide ◽  
Size Dependence ◽  
Phosphorescence Lifetime ◽  
Alkali Halide Crystals ◽  
Cation Size

Single-component small-molecule white light organic phosphors

2017 ◽  
Vol 53 (66) ◽  
pp. 9269-9272 ◽  
Author(s):  
Ning-Ning Zhang ◽  
Cai Sun ◽  
Xiao-Ming Jiang ◽  
Xiu-Shuang Xing ◽  
Yong Yan ◽  
...  
Keyword(s):  
Solid State ◽  
Small Molecule ◽  
White Light ◽  
Light Emission ◽  
White Light Emission ◽  
Single Component ◽  
Supramolecular Aggregate ◽  
Organic Phosphors

A family of two small and easily synthesizable 1,2,3-triazole molecules with intrinsic white-light-emission in the solid state has been reported. The white light is assigned to the supramolecular aggregate emission (SAE) that is unusual for single-component white light phosphors.

scholarly journals White Electrophosphorescent Devices having Multi-organic Phosphors Doped Layers

2004 ◽  
Vol 124 (11) ◽  
pp. 1053-1058
Author(s):  
Nobuhiro Ando ◽  
Yuichiro Kawamura ◽  
Julie J. Brown ◽  
Hiroyuki Sasabe ◽  
Chihaya Adachi
Keyword(s):  
Organic Phosphors
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