emission intensity ratio
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RSC Advances ◽  
2021 ◽  
Vol 11 (55) ◽  
pp. 34735-34741
Author(s):  
Karina Nigoghossian ◽  
Alena N. Kulakova ◽  
Gautier Félix ◽  
Victor N. Khrustalev ◽  
Elena S. Shubina ◽  
...  

Tetranuclear silsesquioxane cages with tunable thermosensitive Tb3+-to-Eu3+ energy transfer were used for temperature sensing based on the Tb3+-to-Eu3+ emission intensity ratio (LIR) with excellent linearity and sensitivity.



2019 ◽  
Vol 91 (11) ◽  
pp. 1757-1767 ◽  
Author(s):  
Vit Prokop ◽  
Lukas Strizik ◽  
Jiri Oswald ◽  
Milan Vlcek ◽  
Ludvik Benes ◽  
...  

Abstract The paper reports on ≈1.5 μm Stokes photoluminescence (PL) emission and upconversion photoluminescence (UCPL) emission in the visible and near-infrared spectral region in Er3+-doped Ge25Ga8As2S65 chalcogenide glasses at pumping wavelengths of 980 and 1550 nm. The ≈1.5 μm PL emission spectra are broadened with increasing concentration of Er ions which is discussed in terms of radiation trapping and UCPL dynamics affecting the Er3+: 4I13/2 level lifetime. The UCPL emission was observed at ≈530, ≈550, ≈660, ≈810 and ≈990 nm and its overall intensity as well as red-to-green UCPL emission intensity ratio increases with increasing Er concentration. To explore the UCPL dynamics we measured double logarithmic dependency of green (≈550 nm) and red (≈660 nm) UCPL emission versus pump power at pumping wavelength of 975 nm. Moreover, we measured quadrature frequency resolved spectroscopy (QFRS) on green UCPL emission (≈550 nm) using 975 nm pumping wavelength and various excitation powers. The QFRS spectra on green UCPL were analyzed in term of QFRS transfer function for three-level model from which we deduced energy transfer upconversion rate w11 (s−1) originating from Er3+: 4I11/2, 4I11/2→4F7/2, 4I15/2 transitions.



2017 ◽  
Vol 36 (1) ◽  
Author(s):  
Seiichi Uchiyama ◽  
Chie Gota

AbstractRecently, numerous luminescent molecular thermometers that exhibit temperature-dependent emission properties have been developed to measure the temperatures of tiny spaces. Intracellular temperature is the most interesting and exciting applications of luminescent molecular thermometers because this temperature is assumed to be correlated with all cell events, such as cell division, gene expression, enzyme reaction, metabolism, and pathogenesis. Among the various types of temperature-dependent emission parameters of luminescent molecular thermometers, the emission intensity ratio at two different wavelengths is suitable for accurate and accessible intracellular temperature measurements. In this review article, luminescent molecular thermometers that exhibit a temperature-dependent emission intensity ratio in living cells are summarized, and current progress in intracellular thermometry is outlined.



RSC Advances ◽  
2017 ◽  
Vol 7 (2) ◽  
pp. 694-703 ◽  
Author(s):  
Shuvaraj Ghosh ◽  
Durga Basak

An enhanced UV/VIS emission intensity ratio and UV photoresponse have been evidenced in the rapidly cooled sol–gel ZnO films.



2016 ◽  
Vol 7 (19) ◽  
pp. 3277-3299 ◽  
Author(s):  
Alaa S. Abd-El-Aziz ◽  
Amani A. Abdelghani ◽  
Brian D. Wagner ◽  
Elsayed M. Abdelrehim

A series of fluorescent dendrimers with pyrene moieties exhibited aggregation enhanced excimer emission (AEEE). Increases in the dendrimer generation caused emission at 480 nm with a high excimer/monomer emission intensity ratio.



2016 ◽  
Vol 4 (11) ◽  
pp. 2165-2169 ◽  
Author(s):  
Peng Li ◽  
Huanrong Li

We develop a luminescent platform based on Eu3+ and Tb3+ co-doped nanozeolite to realize the probing of amine solvents. Such a luminescence sensor can classify amine solvents and achieve an excellent fingerprint correlation between the amine solvents (with larger pKa values) and the emission intensity ratio (IEu/ITb), which is ratiometric.



2014 ◽  
Vol 1736 ◽  
Author(s):  
Kenjo Matsui ◽  
Kosuke Horikawa ◽  
Yugo Kozuka ◽  
Kazuki Ikeyama ◽  
Daisuke Komori ◽  
...  

ABSTRACTWe have fabricated light emitting diodes (LEDs) in which two active regions separated with a Mg-doped GaN intermediate layer were placed in a single pn junction toward periodic gain structures (PGS) for blue vertical-cavity surface emitting lasers (VCSELs). By current density dependence on a emission intensity ratio from two different active regions, we obtained a very stable emission intensity ratio over 1 kA/cm2. This result is also confirmed with the simulation result. Furthermore, we found that the difference of emission wavelength affect the carrier injection and the emission intensity ratio. On the basis of this result, the optimized well-balanced Mg concentration in the intermediate layer for the two identical active regions were estimated approximately 5 x 1018 cm-3.



Eos ◽  
2011 ◽  
Vol 92 (35) ◽  
pp. 291-292 ◽  
Author(s):  
Tom G. Slanger ◽  
Brian D. Sharpee ◽  
Dušan A. Pejaković ◽  
David L. Huestis ◽  
Manuel A. Bautista ◽  
...  




2006 ◽  
Vol 60 (1) ◽  
pp. 61-64 ◽  
Author(s):  
Kenichiro Tsuyuki ◽  
Satoru Miura ◽  
Nasrullah Idris ◽  
Koo Hendrik Kurniawan ◽  
Tjung Jie Lie ◽  
...  


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