2023
DOI: 10.1038/s41598-023-28583-3
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Up-conversion emission in transition metal and lanthanide co-doped systems: dimer sensitization revisited

Abstract: Lanthanide (Ln) co-doped transition metal (TM) upconversion (UC) co-doped systems are being intensively investigated for their exciting applications in photonics, bioimaging, and luminescence thermometry. The presence of TM, such as Mo6 + /W6 +, Mn2 +, or Fe3 + determines significant changes in Ln UC emission, such as intensity enhancement, colour modulation, and even the alteration of the photon order. The current mechanism assumes a ground-state absorption/excited-state absorption (ESA/GSA) in TM-Yb dimer fo… Show more

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Cited by 2 publications
(3 citation statements)
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“…Some formulations (N, OD-AC; N, SCD-AC and N, SCD-BC) exhibited structured green and red bands maybe due to the saturation of the detector and not to the emission from different excited states [42]. Similar structured bands were also reported for different NaYF 4 :Yb 3+ , Er 3 formulations [38,39,43].…”
Section: Physicochemical Properties Of Ucnpssupporting
confidence: 63%
“…Some formulations (N, OD-AC; N, SCD-AC and N, SCD-BC) exhibited structured green and red bands maybe due to the saturation of the detector and not to the emission from different excited states [42]. Similar structured bands were also reported for different NaYF 4 :Yb 3+ , Er 3 formulations [38,39,43].…”
Section: Physicochemical Properties Of Ucnpssupporting
confidence: 63%
“…On incorporation of Mo 6+ in the codoped Bi 2 WO 6 phosphors, the UC emission from Er 3+ ions occurs via the sensitization from Yb 3+ –MoO 4 2− dimer. 36–38 The energy states of Yb 3+ ( 2 F 7/2 and 2 F 5/2 ) and MoO 4 2− ( 1 A 1 , 3 T 1 , 3 T 2 , 1 T 1 , and 1 T 2 ) make the dimer states by electronic coupling. 39,40 The ions at the ground state | 2 F 7/2 , 1 A 1 〉 absorb 980 nm photons and are excited to the intermediate excited state | 2 F 5/2 , 1 A 1 〉 level via GSA.…”
Section: Resultsmentioning
confidence: 99%
“…Again, a few ions in the 4 On incorporation of Mo 6+ in the codoped Bi 2 WO 6 phosphors, the UC emission from Er 3+ ions occurs via the sensitization from Yb 3+ -MoO 4 2À dimer. [36][37][38] The energy states of Yb 3+…”
Section: Optical Studiesmentioning
confidence: 99%