Up-conversion and down-shifting emission traits of Er3+-doped CdO–V2O5–ZnO–B2O3 novel inverted glasses for photonic applications

IF 3.8 3区材料科学 Q2 MATERIALS SCIENCE, MULTIDISCIPLINARY

Optical Materials Pub Date : 2025-04-03 DOI:10.1016/j.optmat.2025.116970

O. Soriano-Romero , M.Y. Espinosa-Cerón , S. Carmona-Tellez , U. Caldiño , Ma E. Zayas , C. Falcony , R. Lozada-Morales , A.N. Meza-Rocha

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Abstract

Er³⁺-doped CdO–V₂O₅–ZnO–B₂O₃ (CVZB-Er) inverted glasses were synthesized by the melt-quenching method. X-ray diffraction (XRD) patterns showed an amorphous structure in all Er³⁺ doping ranges. This fact was verified by the line shape of Raman spectra, which revealed two broad vibrational bands attributed to V₂O₅ and B₂O₃ glass former species. The direct optical band gap (

E_{g}^{d}

) values were found around 2.74 eV, without tendency with Er³⁺ concentration. Under 980 nm laser excitation, the down-shifting emission spectra exhibited the featured near-infrared Er³⁺: ⁴I_13/2 → ⁴I_15/2 emission band. Meanwhile, the upconverting (UC) emission spectra, with color purities up to 97 %, displayed the well-known green and red emission bands related to relaxations from the (²H_11/2, ⁴S_3/2) and ⁴F_9/2 excited states to the ⁴I_15/2 ground one, respectively. This process is dominated by a linear decay mechanism, as revealed by the dependence of the intensity versus the excitation laser power. The Judd-Ofelt (JO) parameters, obtained by the least-square method from the experimental and calculated oscillator strengths, resulted in Ω₂ = 6.43 × 10⁻²⁰ cm², Ω₄ = 0.96 × 10⁻²⁰ cm² and Ω₆ = 1.53 × 10⁻²⁰ cm² for the CVZB glass activated with 2.8 mol% of Er³⁺. Such values are close to those reported in other glass systems. Moreover, the radiative transitions arising from the ⁴I_13/2 and ⁴S_3/2, states to the ⁴I_15/2 ground one presented radiative branching ratio (

β_{R}

) values higher than 0.6, and total radiative transfer probabilities

A_{T}

(⁴I_13/2

\to

⁴I_15/2) = 782.46 s⁻¹ and

A_{T}

(⁴S_3/2

\to

⁴I_15/2) = 10248.56 s⁻¹. For the ⁴I_13/2→⁴I_15/2 emission transition, laser parameters such as the stimulated emission cross-section (σ_em(λ) = 1.57 × 10⁻²⁰ cm²), gain bandwidth (σ_em(λ) × Δλ_em=9.3 × 10⁻²⁶ cm³), optical gain (σ_em(λ) ×

τ_{R}

=2.0 × 10⁻²³ cm²s) and quantum yield (η=0.33) were calculated.

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Er3+掺杂CdO-V2O5-ZnO-B2O3新型光子倒置玻璃的上转换和下移发射特性

采用熔淬法制备了Er3+掺杂的CdO-V2O5-ZnO-B2O3 （CVZB-Er）倒置玻璃。x射线衍射（XRD）结果表明，Er3+掺杂范围内均呈非晶结构。喇曼光谱的线形证实了这一事实，显示出V2O5和B2O3玻璃前体物质的两条宽振动带。直接光学带隙（Egd）值在2.74 eV左右，与Er3+浓度无关。在980 nm激光激发下，下移发射光谱呈现出具有特征的近红外Er3+: 4I13/2→4I15/2发射带。同时，上转换（UC）发射光谱显示出众所周知的绿色和红色发射带，颜色纯度高达97%，分别与（2H11/2, 4S3/2）和4F9/2激发态弛豫到4I15/2基态有关。这一过程以线性衰减机制为主导，这是由激发激光功率与强度的关系所揭示的。用最小二乘法从实验和计算得到的振子强度得到Judd-Ofelt （JO）参数，结果表明，当Er3+浓度为2.8 mol%时，CVZB玻璃的振子强度分别为Ω2 = 6.43 × 10−20 cm2、Ω4 = 0.96 × 10−20 cm2和Ω6 = 1.53 × 10−20 cm2。这些值接近其他玻璃系统中报告的值。从4I13/2和4S3/2状态到4I15/2地态的辐射转移呈现出高于0.6的辐射分支比（βR），总辐射转移概率AT (4I13/2→4I15/2) = 782.46 s−1,AT (4S3/2→4I15/2) = 10248.56 s−1。对于4I13/2→4I15/2的发射跃迁，计算了受激发射截面（σem(λ) = 1.57 × 10−20 cm2）、增益带宽（σem（λ） × Δλem=9.3 × 10−26 cm3）、光增益（σem（λ） × τR=2.0 × 10−23 cm2s）和量子产率（η=0.33）等激光参数。

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来源期刊

Optical Materials 工程技术-材料科学：综合

CiteScore

6.60

自引率

12.80%

发文量

1265

审稿时长

38 days

期刊介绍： Optical Materials has an open access mirror journal Optical Materials: X, sharing the same aims and scope, editorial team, submission system and rigorous peer review. The purpose of Optical Materials is to provide a means of communication and technology transfer between researchers who are interested in materials for potential device applications. The journal publishes original papers and review articles on the design, synthesis, characterisation and applications of optical materials. OPTICAL MATERIALS focuses on: • Optical Properties of Material Systems; • The Materials Aspects of Optical Phenomena; • The Materials Aspects of Devices and Applications. Authors can submit separate research elements describing their data to Data in Brief and methods to Methods X.