Applied Materials Today
·
2025
·
IF 6.9
Wasim Ullah Khan,Waheed Ullah Khan,Haiou Zhu
Thermal quenching and brightness are significant challenges for many phosphors, particularly those used in WLEDs, restricting their effectiveness for large-scale implementation. However, developing phosphors with both anti-thermal quenching (anti-TQ) and high brightness remains quite challenging. Here, we report on the synergistic effect (SE) of energy transfer (ET) offset enabling anti-TQ and intrinsic suppression of concentration quenching (CQ) in sensitized photoluminescent schemes. Anti-TQ (102.1%@400 K) is achieved through the synergistic effect of ET and strong structural rigidity. The chromaticity-shifting (ΔEs) level is 8.63×10 −3 , indicating that it retains PL thermal stability comparable to commercial phosphors. The sensitization effects were investigated both experimentally and through theoretical models as a function of Dy 3+ concentrations. The ET process were studied based on the force electric dipole at each ion, achieving an efficiency of 83.4% and ET rates of 165.8%. The Ca 3 ScAl 3 B 4 O 15 :0.015Tm 3+ ,0.12Dy 3+ -based WLED exhibits satisfactory parameters of R a (83.9) and low-CCT (3345 K). The results highlight how emitters play a crucial role in dissipating excitation energies, offering a new avenue for improving the efficiency of sensitized luminescent materials.
研究领域:
材料科学
·
光学
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产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2018
·
IF 6.735
Yongying Yang,Yuandong Wu,Dajiang Mei,Yi Qu
The development of luminescent crystal sensors for monitoring temperature changes and recording thermal history is still an interesting challenge because their wide applications in several industrial fields and their good thermal stability in harsh environments. Herein, we report a luminescent crystal sensor based on Lead-based complex for recording the high temperature history (>230 °C). Seven kinds of Lead-based complexes are designed and synthesized under an optimizing strategy for obtaining the crystal luminophores with high emissive brightness. Among them, complexes 1 ( Pb ( 2 , 2 ′ - bipy ) I 2 ), 5 ( Pb ( 1 , 10 - phen ) I 2 ) and 6 ( Pb 1 , 10 - phen 2 I 2 ) show bright luminescence with the maximum emission at 595 nm, 565 nm and 592 nm, all of which use I − as the halide ligand. Thermogravimetric analysis results indicate that 5 and 6 show high degraded temperature at 230 and 330 °C, respectively. Combing with their different emissive colors, the transition process from 6 to 5 can be used to construct a high temperature recorder with the ratiometric response. Further experiments evidence that complex 6 can stably transits into 5 even at 270 °C through the partial degradation of the organic ligand. Notably, the emissive colors vary from orange (CIE coordination: 0.515, 0.472) to yellow (CIE coordination: 0.394, 0.554) that allows easy visualization by naked eyes. We believe that this work provides a stabilization strategy of luminescent complexes and extends their applications in more harsh industrial conditions.
研究领域:
材料科学
·
化学
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DOI
高影响因子
MOLECULES
·
2024
·Vol. 29
·期 24
·5887
·
IF 4.2
Jiaxiang Liu,Yongwen Zhang,Ruijuan Yao,Haitao Ren,Weijie Wang,Haohao Feng,Wentao Li,Zongcheng Miao
Achieving superior circularly polarized luminescence brightness (BCPL) is an important subject and continuous challenge for chiroptical materials. Herein, by applying a binary molecular design for the synthesis of chiral organo-Tb3+molecules, a novel pair of mononuclear chiraltris-pyrazolate-Tb3+enantiomers, [Tb(PMIP)3(R,R-Ph-PyBox)] (2) and [Tb(PMIP)3(S,S-Ph-PyBox)] (5), have been synthesized and characterized. The three 1-phenyl-3-methyl-4-(isobutyryl)-5-pyrazolone (HPMIP) ligands play the role of efficient luminescence sensitizers and strong light-harvesting antennas, while the enantiopure 2,6-bis(4-phenyl-2-oxazolin-2-yl) pyridine ligand (R,R/S,S-Ph-PyBox) is employed as the strong point-chiral inducer. With the proper combination of theHPMIPandChiral-Ph-PyBoxwithin the Tb3+enantiomers, strong (PMIP)−-centered π-π*electronic absorption (ε263 nm= 38,400–39,500 M−1cm−1) and brilliant high-purity ligand-sensitized Tb3+-centered green luminescence (ΦPL= 47–48%) were observed. In addition, a clear circularly polarized luminescence (CPL) activity (|glum| = 0.096–0.103) was also observed, resulting in a strongBCPL(610–623 M−1cm−1) for the two Tb3+enantiomers from the hypersensitive transitions. Our results offer an effective path to develop high-performance chiroptical organo-Tb3+luminophores.
研究领域:
化学
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材料科学
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DOI
PubMed
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 104
·59733-59739
·
IF 3.708
Yingying Du,Ping Yang,Hsueh-Shih Chen,Quande Che,Yunshi Liu,Haiyan He,Yanping Miao,Jie Zhao
Highly luminescent hydrophobic CdSe and CdSe/CdxZn1−xS quantum dots (QDs) were synthesized via an organic route. The phase transfer of the QDs was carried out through a ligand exchange from 3-aminopropyltrimethoxysilane (APS) instead of an organic capping agent to get aqueous QDs. A functional sol–gel SiO2 sol with a high QD concentration was obtained from the aqueous QD colloidal solution with APS through the hydrolysis and condensation which subsequently occurred. Flexible inorganic SiO2 films with QDs were fabricated via various methods. The photodegradation experiments of the resulting films were completed. It is surprising that the QDs in films were revealed to be highly stable. Especially, the PL intensity of the films increased dramatically after irradiation by 365 nm UV light. By integrating a thin CdSe QD–silica film on a solar cell, the enhanced current demonstrated that a thin film can facilitate the continuous development of solar cells. Because of their high PL brightness, multicolor emission, flexibility and stability, these films will have great potential applications.
研究领域:
材料科学
·
纳米技术
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DOI
高影响因子
INORGANIC CHEMISTRY
·
2024
·
IF 4.3
Jiaxiang Liu,Wenqi Song,Huizhe Niu,Ying Lu,Haiyan Yang,Wentao Li,Yu-zhen Zhao,Zongcheng Miao
In order to facilitate the practical application of circularly polarized luminescence (CPL) active molecules, the CPL brightness (BCPL) must be optimized. We have applied a binary modular strategy to synthesize two chiral organo-Tb3+ complexes, [Tb(Coum)3(1R,2R-Ph-PyBox)] (2) and [Tb(Coum)3(1S,2S-Ph-PyBox)] (5), combining 3-acetyl-4-hydroxy-coumarin (Coum) and enantiopure 2,6-bis(4-phenyl-2-oxazolin-2-yl) pyridine (1R,2R/1S,2S-Ph-PyBox). The photophysical properties of these novel complexes have been fully characterized. The combined point-chiral induction capability of chiral bis(oxazoline) derivatives and the outstanding photophysical properties of the coumarin-derived ligand have resulted in an intense excited-state chiroptical activity (|glum| = 0.097–0.103) for both Tb3+ enantiomers, with a bright Tb3+-centered high-purity green emission (ΦPL = 74%) and enhanced antenna-centered absorption behavior (ε320 nm = 47820–47940 M–1 cm–1). A superior BCPL (1132.7–1205.8 M–1 cm–1 at 5D4 → 7F5) has been established for complexes 2 and 5. The strategy adopted in this work provides a new route to chiroptical organo-Tb3+ luminophores with outstanding comprehensive performance.
研究领域:
化学
·
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
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