Two hundred times enhancement of emission intensity of a heptadentate acyclic sensor coordinated with Zn2+ ion: synthesis, crystal structure and emission properties

2020 ◽  
Vol 73 (11) ◽  
pp. 1730-1743
Author(s):  
Amar Hens
Keyword(s):  
Crystal Structure ◽  
Emission Intensity ◽  
Emission Properties

scholarly journals Crystal Structure, Mesomorphic and Emission Properties of Liquid Crystals Having a 7-(Diethylamino)-3-phenylcoumarin Core

2007 ◽  
Vol 56 (4) ◽  
pp. 195-200 ◽  
Author(s):  
Haruko Takechi ◽  
Kanji Kubo ◽  
Hajime Takahashi ◽  
Taisuke Matsumoto
Keyword(s):  
Crystal Structure ◽  
Liquid Crystals ◽  
Emission Properties

High Pressure Effects on the Emission Properties and Crystal Structure of Coumarin 120

ChemPhysChem ◽  
2004 ◽  
Vol 5 (1) ◽  
pp. 124-127 ◽  
Author(s):  
Hong Li ◽  
Liming He ◽  
Bo Zhong ◽  
Yi Li ◽  
Shikang Wu ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Pressure Effects ◽  
Emission Properties ◽  
Coumarin 120 ◽  
High Pressure Effects

Effects of Sm3+ Doping on the Photoluminescence Properties of Ca9Eu1-xSmx(VO4)7 Red-Emitting Phosphors

2012 ◽  
Vol 512-515 ◽  
pp. 1488-1493 ◽  
Author(s):  
Li Hong Liu ◽  
Rong Jun Xie ◽  
Xu Dong Sun ◽  
Qing Huang ◽  
Naoto Hirosaki
Keyword(s):  
Crystal Structure ◽  
Solid State ◽  
Excitation Energy ◽  
Solid State Reaction ◽  
Emission Intensity ◽  
Solid State Reaction Method ◽  
Photoluminescence Properties ◽  
Reaction Method ◽  
White Leds ◽  
Uv Led

This paper reports the photoluminescence properties of Ca9Eu1-xSmx(VO4)7 (x=0.2-0.4) synthesized at 1250 oC in air for 12 h using traditional solid-state reaction method. With the increase of Sm3+ substitution amount, purity Ca9Eu1-xSmx(VO4)7 phase was obtained even when the Eu3+ ions were totally substituted by Sm3+. The experimental results showed that when Sm3+ was codoped with Eu3+ into Ca9Eu1-xSmx(VO4)7 crystal structure, Sm3+ would act as a sensitizer and transfer the excitation energy to Eu3+ ions and finally enhance the emission intensity of Ca9Eu1-xSmx(VO4)7 under 405 nm excitation, which leads to more favorite of this kind of phosphor used in UV LED based white LEDs.

Crystal Structure offac−Ir(ppy)3and Emission Properties under Ambient Conditions and at High Pressure†

2005 ◽  
Vol 17 (7) ◽  
pp. 1745-1752 ◽  
Author(s):  
Josef Breu ◽  
Philipp Stössel ◽  
Sigurd Schrader ◽  
Alexander Starukhin ◽  
Walter J. Finkenzeller ◽  
...  
Keyword(s):  
Crystal Structure ◽  
High Pressure ◽  
Ambient Conditions ◽  
Emission Properties

scholarly journals Photoluminescence and energy transfer of YAG: Ce3+, Gd3+, Bi3+

2016 ◽  
Vol 06 (04) ◽  
pp. 1650029 ◽  
Author(s):  
Meidan Que ◽  
Wenxiu Que ◽  
Ting Zhou ◽  
Jinyou Shao ◽  
Lingbing Kong
Keyword(s):  
Crystal Structure ◽  
Energy Transfer ◽  
Emission Intensity ◽  
Emission Band ◽  
Emission Spectra ◽  
Excitation Band ◽  
Size Mismatch ◽  
White Leds ◽  
Orange Region ◽  
Potential Applications

In this study, Gd[Formula: see text] and Bi[Formula: see text] ions act to redshift the emission band to orange region, and to enhance significantly the maximum emission of YAG: Ce[Formula: see text]. On account that size mismatch between the host and the doped Gd[Formula: see text] ion, the crystal structure turns soft, and the emission spectra are not tuned from 540 to 570[Formula: see text]nm but decreased the emission intensity. Accordingly, an effective way to increase emission intensity is to introduce Bi[Formula: see text] ion into the YAG: Ce[Formula: see text], Gd[Formula: see text] phosphors. Experimental results show partial overlapping between the emission band of Bi[Formula: see text] ion and the excitation band of Ce[Formula: see text] ion, indicating that the energy transfer from Bi[Formula: see text] to Ce[Formula: see text] ions exists in the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor. Bi[Formula: see text] ion can serve as the activator to provide energy for Ce[Formula: see text] ion via cross relaxation phenomenon. Therefore, the (Y[Formula: see text]Ce[Formula: see text]Gd)Al5O[Formula: see text]: Bi[Formula: see text] phosphor could have potential applications in warm white LEDs.

The new O,O and N,O type ligands and their Cu(II) and Ni(II) complexes: Crystal structure, absorption-emission properties and superoxide dismutase mimetic studies

2017 ◽  
Vol 462 ◽  
pp. 130-141 ◽  
Author(s):  
Reyhane Kose ◽  
Seyit Ali Gungor ◽  
Sultan Erkan Kariper ◽  
Muhammet Kose ◽  
Mukerrem Kurtoglu
Keyword(s):  
Crystal Structure ◽  
Superoxide Dismutase ◽  
Emission Properties

Absorption and Emission Properties of Bismuth-Doped Silicate Glass

2013 ◽  
Vol 401-403 ◽  
pp. 567-570
Author(s):  
Bing Xu ◽  
Xiang Jun Xu ◽  
Hou Mei Dai ◽  
Zhen Wei Deng ◽  
Xiang Qun Lv
Keyword(s):  
Silicate Glass ◽  
Emission Intensity ◽  
Tunable Lasers ◽  
Fiber Amplifiers ◽  
Absorption Intensity ◽  
Absorption And Emission ◽  
Emission Properties ◽  
Nir Emission ◽  
Doped Glass ◽  
Co Doped

Single Bi-doped and M/Bi co-doped silicate glass (M=Al, Y, La) were prepared and broadband NIR emission were observed when the glass samples were pumped by 514 nm and 808 nm LD, respectively. The absorption intensity and emission intensity of the Y/Bi co-doped glass and La/Bi co-doped glass decrease obviously compared to single Bi-doped glass. The absorption intensity in the region of 600-1100 nm and the NIR emission intensity pumped by an 808 nm LD were remarkably enhanced by the introduction of Al2O3into the Bi-doped silicate glass. It is suggested that the Al/Bi co-doped silicate glass might be very useful for broadband fiber amplifiers and widely tunable lasers.

Halogen-bonding contacts determining the crystal structure and fluorescence properties of organic salts

2017 ◽  
Vol 41 (17) ◽  
pp. 9444-9452 ◽  
Author(s):  
Jing-Wen Wang ◽  
Chen Chen ◽  
Yao-Ja Li ◽  
Yang-Hui Luo ◽  
Bai-Wang Sun
Keyword(s):  
Crystal Structure ◽  
Halogen Bonding ◽  
Inorganic Anions ◽  
Fluorescence Properties ◽  
Organic Salts ◽  
Absorption And Emission ◽  
Emission Properties ◽  
3D Networks

Different inorganic anions tuning halogen-bonding contacts to form different 3D networks with various absorption and emission properties.

Effect of Ce3+ Concentration on the Luminescence Properties of Ce3+/Er3+/Yb3+ Tri-Doped NaYF4 Nanocrystals

2016 ◽  
Vol 16 (4) ◽  
pp. 3749-3753 ◽  
Author(s):  
Xuee Liu ◽  
Jianbei Qiu ◽  
Xuhui Xu ◽  
Dacheng Zhou
Keyword(s):  
Energy Transfer ◽  
Hydrothermal Method ◽  
Fluorescence Intensity ◽  
Emission Intensity ◽  
Doping Concentration ◽  
Near Infrared ◽  
Luminescence Properties ◽  
Emission Mechanism ◽  
Emission Properties ◽  
Nir Emission

In order to investigate the effect of Ce3+ concentration on the emission properties of Er3+/Yb3+ codoped NaYF4 nanocrystals, Ce3+/Er3+/Yb3+ tri-doped NaYF4 nanocrystals were prepared through a facile EDTA-assisted hydrothermal method. The upconversion (UC) and the near infrared (NIR) emission properties of Er3+ ions were systematically investigated in the NaYF4:Ce3+/Er3+/Yb3+ nanocrystals. Under 980 nm excitation, with the increasing of Ce3+ concentration, the emission intensity of Er3+ at 1550 nm (4I13/2 → 4I15/2) band increases initially and then decreases. The increase of the fluorescence intensity of 1550 nm is due to the energy transfer between Er3+ and Ce3+ ions: Er3+:4I11/2 +Ce3+:2F5/2 → Er3+:4I13/2 +Ce3+:2F7/2. But when Ce3+ doping concentration is 2.0%, the cross relaxation:Er3+:4I13/2 +Ce3+:2F5/2 →Er3+:4I15/2 +Ce3+:2F7/2 happens, which depopulates the 4I13/2 level of Er3+ and results in the decrease of the emission intensity of Er3+ at 1550 nm band. Meanwhile, incorporation of Ce3+ dramatically decreases the visible UC emission intensity. A possible emission mechanism was proposed.

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