Luminescence properties of multicolor emitting La4GeO8:Tb3+,Eu3+ phosphors

Chi, Fengfeng; Pan, Liangliang; Jiang, Bin; Ji, Zhangchao; Cheng, Jie; Wang, Bing; Wei, Xiantao; Liu, Shengli

doi:10.1016/j.ceramint.2022.09.230

Cited by 20 publications

(3 citation statements)

References 47 publications

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“…[ 31 ] In addition, an energy bandgap value of 3.67 eV was observed to be originating from transitions between the valence band maximum composed of S 3p orbitals and the conduction band minimum composed of La‐ 3d, La‐ 4f, S‐ 3p, and Ge ‐4s orbitals of La 4 (GeS 2 O 2 ) 3 crystals. [ 32 ] These two examples provide an evidence about the origin of the bandgap of La 6 Ge films which are coated onto glass substrates. In fact the bond length of La–Ge being ≈3.146 Å [ 33 ] is longer than the bond length of La–O (2.66 Å) [ 34 ] and La–O is longer than that of Ge–O (1.69 Å).…”

Section: Resultsmentioning

confidence: 98%

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Alkhamisi

Qasrawi

Khanfar

2023

Cryst. Res. Technol.

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Lanthanum germanide (La6Ge) thin films are successfully fabricated using the thermal evaporation technique under a vacuum pressure of 10−5 mbar. The resulting films display an orthorhombic structure, characterized by lattice parameters of a = 8.725 Å, b = 8.063 Å, and c = 5.569 Å. Optical analysis of the La6Ge thin films reveal their high transparency, with an energy bandgap of 3.75±0.04 eV. The bandgap exhibits indirect allowed transitions and featured energy band tails with widths measuring (1.64±0.14) eV. In addition, dielectric dispersion analyses indicate the presence of two dominant dielectric resonance peaks centered at 3.15 and 2.08 eV. Moreover, the La6Ge films demonstrate a terahertz (THz) cutoff frequency of 1.0 THz when illuminated with infrared and visible light. This cutoff frequency increases to 45.6 THz in the ultraviolet range. Furthermore, by utilizing the Drude–Lorentz method, the investigation of optical conductivity parameters reveals that the lanthanum germanide optical filters can achieve free hole density and drift mobility values of 14.44 cm2 V−1 s−1 and 2.8×1018 cm−3, respectively, under infrared light irradiation. The outstanding optical and dielectric properties exhibited by the La6Ge thin films make them excellent candidates for highly transparent optical filters suitable for terahertz technology.

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Section: Resultsmentioning

confidence: 98%

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Alkhamisi

Qasrawi

Khanfar

2023

Cryst. Res. Technol.

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“…The determined E a value for thermal quenching is 0.2206 eV, which is further supported by recent literature, i.e. , Ca 2 LuHf 2 Al 3 O 12 :Ce 3+ , Tb 3+ , 53 Ca 2 YHf 2 Al 3 O 12 :Ce 3+ ,Tb 3+ , 54 Ca 14 Al 10 Zn 6 O 35 :Tb 3+ , 55 Ba 3 YB 3 O 9 :Tb 3+ , 56 RbBaBP 2 O 8 :Tb 3+ , 57 Ca 2 Ga 2 SiO 7 :Tb 3+ , 58 La 4 GeO 8 :Tb 3+ , Eu 3+ , 59 Ba 3 (ZnB 5 O 10 )PO 4 :Tb 3+ , 60 Bi 3 TeBO 9 :Tb 3+ 61 and Na 5 Lu 9 F 32 :Tb 3+ . 62 In the present study, multiphonon-assisted nonradiative transition did not occur.…”

Section: Resultsmentioning

confidence: 99%

Cool green-emissive Y₂Si₂O₇:Tb³⁺ nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications

Kumar,

Singh,

Kadyan

et al. 2024

RSC Adv.

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“…However, it is clear that adjusting the dopant concentration [36,39] and introducing ions of different luminous colors, including different Ln 3+ ions [37,40] and non-rare-earth ions [41,42], are still the principal strategies by which to achieve multicolor luminescence; therefore, multicolor luminescence is still absent in composition-fixed Ln 3+ -doped CaZrO 3 . In addition, for the recently studied Tb 3+ /Eu 3+ co-doped colorful phosphors beyond CaZrO 3 , such as La 4 GeO 8 :Tb/Eu [43], K 5 Eu(MoO 4 ) 4 :Tb [44], MgF 2 :Tb/Eu [45], K 3 Lu(PO 4 ) 2 :Tb/Eu [46], Sr 3 MgSi 2 O 8 :Eu/Tb [47], and Gd 2 B 2 WO 9 :Eu/Tb [48], excitation-dependent multicolor luminescence is also very rare.…”

Section: Introductionmentioning

confidence: 99%

Excitation-Controlled Host–Guest Multicolor Luminescence in Lanthanide-Doped Calcium Zirconate for Information Encryption

Wang,

Han,

Liu

et al. 2023

Molecules

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Efficient control over lanthanide luminescence by regulating excitations offers a real-time and reversible luminescence-managing strategy, which is of great importance and highly desirable for various applications, including multicolor display and information encryption. Herein, we studied the crystal structure, luminescence properties, and mechanisms of undoped and Tb3+/Eu3+-doped CaZrO3 in detail. The intrinsic purple-blue luminescence from host CaZrO3 and the introduced green/red luminescence from guest dopants Tb3+/Eu3+ were found to have different excitation mechanisms and, therefore, different excitation wavelength ranges. This enables the regulation of luminescent color through controlling the excitation wavelengths of Tb3+/Eu3+-doped CaZrO3. Furthermore, preliminary applications for information encryption with these materials were demonstrated using portable UV lamps of 254 and 302 nm. This study not only promotes the development of multicolor luminescence regulation in fixed-composition materials, but also advances the practical applications of lanthanide luminescent materials in visually readable, high-level anti-counterfeiting and information encryption.

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Luminescence properties of multicolor emitting La4GeO8:Tb3+,Eu3+ phosphors

Cited by 20 publications

References 47 publications

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Cool green-emissive Y₂Si₂O₇:Tb³⁺ nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications

Excitation-Controlled Host–Guest Multicolor Luminescence in Lanthanide-Doped Calcium Zirconate for Information Encryption

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Luminescence properties of multicolor emitting La4GeO8:Tb3+,Eu3+ phosphors

Cited by 20 publications

References 47 publications

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Growth and Characterization of Lanthanum Germanide Thin Films by the Thermal Evaporation Technique

Cool green-emissive Y2Si2O7:Tb3+ nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications

Excitation-Controlled Host–Guest Multicolor Luminescence in Lanthanide-Doped Calcium Zirconate for Information Encryption

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Cool green-emissive Y₂Si₂O₇:Tb³⁺ nanophosphor: auto-combustion synthesis and structural and photoluminescence characteristics with good thermal stability for lighting applications