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Enhanced rare earth photoluminescence in inverse opal photonic crystals and its application for pH sensing
- Source :
- Nanotechnology. 27(40)
- Publication Year :
- 2016
-
Abstract
- Concentration quenching effects of identical rare earth (RE) activator ions and energy transfer (ET) between different RE ions often compromise the photoluminescence (PL) quantum efficiency in RE based luminescence materials. Here, we demonstrate that in NaGd(WO4)2:Tb(3+), Eu(3+) inverse opal photonic crystals (IOPCs), the suppression of the emission line located in the photonic stop band (PSB) and a dramatic increase of the lifetimes of Eu(3+) and Tb(3+) ions are observed. More interestingly, the concentration quenching among Eu(3+) ions and ET from Tb(3+) to Eu(3+) is significantly relieved owing to the periodic empty cavity structure of IOPCs. As a consequence, the luminescent quantum efficiency (QE) of the NaGd(WO4)2:Tb(3+), Eu(3+) IOPCs increases ∼2 times more than that of crushed NaGd(WO4)2:Tb(3+), Eu(3+) powder. In addition, a reusable pH sensor with good linear response (pH 5-10) has been designed based on the high surface-to-volume ratio, high connectivity, and enhanced luminescence of NaGd(WO4)2:Tb(3+), Eu(3+)IOPCs, which could be applied to the dynamical detection of pH value.
- Subjects :
- Photoluminescence
Materials science
Mechanical Engineering
Analytical chemistry
Mineralogy
Inverse
Bioengineering
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
0104 chemical sciences
Ion
Mechanics of Materials
Activator (phosphor)
General Materials Science
Quantum efficiency
Emission spectrum
Electrical and Electronic Engineering
0210 nano-technology
Luminescence
Photonic crystal
Subjects
Details
- ISSN :
- 13616528
- Volume :
- 27
- Issue :
- 40
- Database :
- OpenAIRE
- Journal :
- Nanotechnology
- Accession number :
- edsair.doi.dedup.....d2bcd8b73fced781ab34b48506e1dd62