Enhanced red emission of doped lanthanide ions in Gd2O3: In the perspective of phase transformation

Xu, Dekang; Xie, Feiyan; Li, Yuanhua; Ye, Feng; Feng, Keqin; Liu, Guocong; Lin, Huang; Li, Anming; Qi, Wenjing; Peng, Bo

doi:10.1016/j.optmat.2022.113252

Cited by 3 publications

(1 citation statement)

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“…Lanthanide ion doping for an optically active center in different hosts/matrices has been widely explored, such as in high band gap phosphors (Gd 2 O 3 , GdScO 3 , CaMoO 4 , NaYF 4 , Ca 9 Y(VO 4 ) 7 , etc. ), − traditional semiconductors (CdS, CdSe, GaAs, etc. ), and halide perovskites (ABX 3 , AB′B″X 3 : A = organic/inorganic ion; B, B′, B″ = metal ion; X = Cl, Br, and I). − Particularly, the doping of lanthanides in semiconductor nanocrystals/quantum dots unlocks attractive optoelectronic properties such as for photovoltaics, color and white light emitting diodes (LEDs), and detectors along with different types of sensing, anticounterfeiting, and bioimaging applications.…”

Section: Introductionmentioning

confidence: 99%

Expanding the Emission of CsPbBr₃ Nanocrystals in the Blue Region

Kachhap,

Fatima,

Yadav

et al. 2023

ACS Appl. Opt. Mater.

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We report blue emission, along with the characteristic green emission, in CsPbBr 3 nanocrystals (NCs) due to the doping of Eu 2+ ions. The doping of Eu 2+ was confirmed using TEM-EDAX, FTIR, and XPS techniques. The undoped CsPbBr 3 NCs show sharp green emission peaking at 515 nm (fwhm ∼24 nm). Whereas Eu 2+ :CsPbBr 3 NCs show two emission peaks at 498 and 442 nm with fwhm ∼20 and ∼13 nm, respectively. A shift in the green emission of doped NCs is because of reduced average particle size from 19 to 7 nm. The additional emission peak at 442 nm is assigned due to the 4f 6 ( 7 F J )5d 1 → 4f 7 transition of Eu 2+ ions. The intensities of blue and green emissions are both significantly influenced by changing the excitation wavelengths. The decay dynamics study suggests an energy transfer from CsPbBr 3 to the Eu 2+ ions. It is also inferred that Eu 2+ doping improves the radiative channels. Further, the CIE coordinate analysis depicts virtuous luminous efficacy of the optical radiation and significant color purity (>85%) of the emission spectra under different excitations. These optical studies show that the Eu 2+ :CsPbBr 3 NCs can be a potential candidate for multicolor LEDs, displays, and anticounterfeiting applications.

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