Size and shape modifications, phase transition, and enhanced luminescence of fluoride nanocrystals induced by doping

2013 ◽  
Vol 1 (18) ◽  
pp. 3158 ◽  
Author(s):  
Xiangfu Wang ◽  
Yanyan Bu ◽  
Yang Xiao ◽  
Caixia Kan ◽  
Di Lu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Size And Shape ◽  
Enhanced Luminescence

Enhanced Luminescence Efficiency from Hydrogel Microbead Encapsulated Quantum Dots

2006 ◽  
Vol 959 ◽  
Author(s):  
Arup Neogi ◽  
Santaneel Ghosh ◽  
Jianyou Li ◽  
Tong Cai ◽  
Zhibing Hu
Keyword(s):  
Phase Transition ◽  
Quantum Dots ◽  
Refractive Index ◽  
Optical Properties ◽  
Index Volume ◽  
Volume Density ◽  
Volume Phase Transition ◽  
Thermoresponsive Polymer ◽  
Luminescence Efficiency ◽  
Enhanced Luminescence

ABSTRACTIn this paper, a novel quantum dot (QD) based nanomaterial system is presented for efficient FRET analysis. The quantum dots have been embedded in hydrogel microspheres based on poly(N-isopropylacrylamide) (PNIPAM) a thermoresponsive polymer that undergoes a volume phase transition across the low critical solution (LCST). The optical properties of the quantum dots entrapped within the gel microspheres has been modified due to change in refractive index, volume density of the surrounding hydrogel medium. The QDs encapsulated in the PNIPAM microspheres showed 100–200 % enhancement in the PL efficiency as the microgels shrank at the temperature above the LCST temperature of the gel.

Comparison Between the Phase Transition of Physically Confined Cyclohexane and 1-Decanol inside Nano Porous Silica

2012 ◽  
Vol 1423 ◽  
Author(s):  
Hillary C. Bauer ◽  
Alexandrea D. Safiq ◽  
Jargalsaikhan Dulmaa ◽  
Amer S. Khraisat ◽  
Samuel Amanuel
Keyword(s):  
Phase Transition ◽  
Porous Silica ◽  
Size And Shape ◽  
The Difference ◽  
Spherical Molecule

ABSTRACTThe thickness of non-freezing interfacial 1-decanol molecules has been estimated to be 1.44 ± 0.07 nm. This is smaller than what is estimated for cyclohexane, 2.25 ± 0.14nm. Furthermore, these interfacial molecules have higher density than corresponding bulk cyclohexane and 1-decanol, respectively. However, the change in density of the interfacial molecules is more significant in the case of cyclohexane than 1-decanol. This suggests that the cyclohexane molecules near the walls of the pore are more tightly packed than 1-decanol molecules. Presumably, this is due to the difference in size and shape of the molecules. Cyclohexane, a more spherical molecule, can easily be packed in smaller pores than the longer 1-decanol.

Enhanced luminescence of Sr2SiO4:Dy3+ by sensitization (Ce3+/Bi3+) and its composition-induced phase transition

2012 ◽  
Vol 541 ◽  
pp. 54-59 ◽  
Author(s):  
Le Zhang ◽  
Pengde Han ◽  
Kun Wang ◽  
Zhou Lu ◽  
Lixi Wang ◽  
...  
Keyword(s):  
Phase Transition ◽  
Enhanced Luminescence

Phase transition, morphology transformation and highly enhanced luminescence properties of YOF:Eu3+ crystals by Gd3+ doping

2015 ◽  
Vol 39 (9) ◽  
pp. 7019-7025 ◽  
Author(s):  
Ruiqing Li ◽  
Nannan Zhang ◽  
Linlin Li ◽  
Yimai Liang ◽  
Yali Liu ◽  
...  
Keyword(s):  
Phase Transition ◽  
Crystal Phase ◽  
Luminescence Properties ◽  
Crystal Phase Transition ◽  
Enhanced Luminescence

We report the crystal phase transition, morphology transformation, and greatly enhanced luminescence properties of YOF crystals by Gd3+ doping.

Size and shape effects on the order–disorder phase transition in CoPt nanoparticles

2009 ◽  
Vol 8 (12) ◽  
pp. 940-946 ◽  
Author(s):  
D. Alloyeau ◽  
C. Ricolleau ◽  
C. Mottet ◽  
T. Oikawa ◽  
C. Langlois ◽  
...  
Keyword(s):  
Phase Transition ◽  
Disorder Phase Transition ◽  
Size And Shape ◽  
Shape Effects

Size and shape dependent order–disorder phase transition of Co–Pt nanowires

2012 ◽  
Vol 63 ◽  
pp. 286-291 ◽  
Author(s):  
Bin Ouyang ◽  
Weihong Qi ◽  
Chenze Liu ◽  
Xing Wang ◽  
Lanying Wei ◽  
...  
Keyword(s):  
Phase Transition ◽  
Disorder Phase Transition ◽  
Size And Shape ◽  
Pt Nanowires
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