Sökning: WFRF:(Bagheri Niusha)
> (2023) >
Low-lying excited s...
Low-lying excited state energy trap induced by cross-relaxation - The main origin of concentration quenching in lanthanide upconversion nanoparticles
-
- Huang, Fuhua (författare)
- Henan Univ, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China.;Henan Univ, Henan Ctr Outstanding Overseas Scientists, Kaifeng 475004, Peoples R China.
-
- Bagheri, Niusha (författare)
- KTH,Kvant- och biofotonik
-
- Wang, Li (författare)
- Henan Univ, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China.;Henan Univ, Henan Ctr Outstanding Overseas Scientists, Kaifeng 475004, Peoples R China.
-
visa fler...
-
- Agren, Hans (författare)
- Henan Univ, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China.;Henan Univ, Henan Ctr Outstanding Overseas Scientists, Kaifeng 475004, Peoples R China.
-
- Zhang, Jinglai (författare)
- Henan Univ, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China.;Henan Univ, Henan Ctr Outstanding Overseas Scientists, Kaifeng 475004, Peoples R China.
-
- Widengren, Jerker (författare)
- KTH,Kvant- och biofotonik
-
- Liu, Haichun (författare)
- KTH,Kvant- och biofotonik
-
visa färre...
-
Henan Univ, Coll Chem & Chem Engn, Kaifeng 475004, Henan, Peoples R China;Henan Univ, Henan Ctr Outstanding Overseas Scientists, Kaifeng 475004, Peoples R China. Kvant- och biofotonik (creator_code:org_t)
- Elsevier BV, 2023
- 2023
- Engelska.
-
Ingår i: Journal of Alloys and Compounds. - : Elsevier BV. - 0925-8388 .- 1873-4669. ; 936
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- In lanthanide-doped upconversion nanoparticles (UCNPs), the concentration of emitter ions, also known as activator ions, is usually limited to 1 - 5 mol% due to concentration quenching effects. This circumstance limits the luminescent efficiency of UCNPs' and their use in a variety of application areas. Earlier studies have attributed the activator concentration quenching to migration of energy to the nanoparticle surface, while indicating that cross-relaxation between activator ions had a minor role therein. In this work, we carried out comparative studies on Er3+-doped and Yb3+-Er3+ codoped UCNPs and could, in contrast to this notion, prove a general adverse effect of cross-relaxation between activator ions, here Er3+ ions, on up -conversion luminescence (UCL). The direct result of the cross-relaxation is that the energy of the excitation light is accumulated into a low-lying excited state of Er3+ in the infrared region, so forming a "low-lying excited state energy trap ". As a result, the excitation energy is used for generating down-conversion lu-minescence or for indirectly facilitating UCL channels that are directly related to the low-lying excited state energy trap. The identified effect can be used to regulate UCL channels to achieve a concentrated UCL band that is more favorable for certain applications, e.g., biological imaging.
Ämnesord
- NATURVETENSKAP -- Kemi -- Teoretisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Theoretical Chemistry (hsv//eng)
- NATURVETENSKAP -- Kemi -- Fysikalisk kemi (hsv//swe)
- NATURAL SCIENCES -- Chemical Sciences -- Physical Chemistry (hsv//eng)
Nyckelord
- Upconversion nanoparticles
- Cross-relaxation
- Concentration quenching
- Energy trap
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas