Abstract
The luminescence exhibited by matter has raised the human curiosity for centuries. The rapid emergent of the solid-state white light-emitting diodes based on the luminescent rare earth ions, especially Ce3+ that emits a complementary color (yellow) of blue light and has central contribution to the development of white LEDs, might be considered the latest lighting devices to light the whole twenty-first century. Thus, the luminescent RE3+ compounds have been significantly studied due to their remarkable photonic applications, presently extended from lighting and displays, laser physics to material science, and agriculture and medical diagnostics (especially bioimaging of tissues and cells). Excess works in the form of peer-reviewed articles, chapters, and books have been published on rare earth luminescence and applications. Most of the books contain larger theoretical studies on the photoluminescence spectroscopy of the rare earth ions, which are not easily understandable by the nonspecialized readers and fresh researchers.
The aim of this chapter is to present concise overview on the key concept of luminescence and electronic spectroscopy of rare earth compounds: energy transfer processes, luminescence spectra and their measurements, instrumental techniques, as well as applications (bioimaging and LEDs). In accordance with the title of the book, the content of the chapter is presented in an efficient and simple way to be better understandable by the nonspecialized readers and fresh researchers.
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Abbreviations
- A:
-
Acceptor
- AD:
-
Anno Domini
- CAs:
-
Contrast agents
- CCD:
-
Charge-coupled device
- CET:
-
Cooperative energy transfer
- CFL:
-
Compact fluorescent light
- CIE:
-
Commission Internationale de l’Eclairage
- CRI:
-
Color-rendering index
- CT:
-
Computed tomography
- D:
-
Donor
- DCL:
-
Down-conversion luminescence
- ED:
-
Electric dipole
- EMU:
-
Energy migration-mediated upconversion
- ESA:
-
Excited-state absorption
- ET:
-
Energy transfer
- ETU:
-
Energy transfer upconversion
- FDG:
-
18-Fluorodeoxyglucose
- GaInN:
-
Gallium indium nitride
- GaN:
-
Gallium nitride
- LEDs:
-
Light-emitting diodes
- LMCT:
-
Ligand-to-metal charge transfer
- LPS lamps:
-
Low-pressure sodium lamps
- MCPs:
-
Micro-channel plates
- MD:
-
Magnetic dipole
- MH lamp:
-
Metal halide lamp
- MNPs:
-
Magnetic nanoparticles
- MRI:
-
Magnetic resonance imaging
- ms:
-
Millisecond
- NIR:
-
Near-infrared
- NPs:
-
Nanoparticles
- OPN:
-
Osteopontin
- PA:
-
Photon avalanche
- PAI:
-
Photoacoustic imaging
- PAM:
-
Photoacoustic microscopy
- PET:
-
Positron emission tomography
- PMT:
-
Photomultiplier tubes
- QDs:
-
Quantum dots
- RE:
-
Rare earth
- RGB:
-
Red-green-blue
- S:
-
Singlet state
- SPECT:
-
Single-photon emission computed tomography
- T:
-
Triplet state
- THP-1:
-
Tamm-Horsfall protein-1
- TTA:
-
Thenoyltrifluoroacetonate
- UC:
-
Upconversion
- UCL:
-
Upconversion luminescence
- UCNPs:
-
Upconversion nanoparticles
- UV:
-
Ultraviolet
- YAG:Ce3+ :
-
Y3Al5O12:Ce3+
- α-CD:
-
α-Cyclodextrin
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Acknowledgments
The authors are grateful for the financial support from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES, Brazil) and Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, Brazil) and to The World Academy of Sciences (TWAS) for the advancement of science in developing countries and Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP, Brazil).
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Khan, L.U., Khan, Z.U. (2018). Rare Earth Luminescence: Electronic Spectroscopy and Applications. In: Sharma, S. (eds) Handbook of Materials Characterization. Springer, Cham. https://doi.org/10.1007/978-3-319-92955-2_10
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