| 电荷补偿对Ba2ZnGe2O7：Bi3+荧光粉发光性质的影响 |
| Influence of charge compensation to the luminescence properties of Ba2ZnGe2O7：Bi3+ phosphor |
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| 摘要: 采用高温固相法制备了2个系列的荧光粉样品：Ba2-xZnGe2O7：xBi3+（系列Ⅰ）和Ba1.994-yKyZnGe2O7：0.006Bi3+（系列Ⅱ）。X射线衍射（XRD）测试结果表明，少量Bi3+、K+的掺杂不会明显改变材料的物相结构。样品的荧光光谱测试结果表明，虽然2个系列样品的发光光谱都随组成成分变化有少量变化，但发光颜色基本上均为黄绿色。在358 nm的激发下，荧光粉的发射光谱呈现一个峰值在500 nm的宽发射带，归属于3P1→1S0能级跃迁。在500 nm监测下，荧光粉的最强激发峰位于358 nm，归属于1S0→3P1能级跃迁，此外还有一个位于320 nm的肩峰归属于O2--Bi3+电荷转移带。系列Ⅰ样品的光谱数据结果指出，Bi3+的最佳掺杂量x为0.006。在该基质中，Bi3+掺杂取代Ba2+属于不等价取代，会在晶格中产生Ba2+空位或间隙O2-，对材料的发光强度产生负面影响。对此，采用K+与Bi3+协同掺杂起到电荷补偿的作用，填补Ba2+空位或捕获间隙O2-缺陷。空位被填补或间隙被捕获均减少了晶格畸变，从而使发光强度明显提高。系列Ⅱ样品的光谱数据表明，完全电荷补偿的荧光粉样品相比于没有掺K+的样品，其发光强度提高了约2.5倍。 |
| 关键词: 荧光粉 Ba2ZnGe2O7：Bi3+ 发光性质 光学性能 |
| 基金项目: 国家自然科学基金（No.52172227）资助 |
| Abstract: In this work, two series of phosphors were prepared using high-temperature solid-state reactions: Ba2-xZnGe2O7：xBi3+ (series Ⅰ) and Ba1.994-yKyZnGe2O7：0.006Bi3+ (series Ⅱ). X-ray diffraction (XRD) analysis demonstrated that the doping of a small amount of Bi3+ and K+ did not significantly change the phase structure of the material. The fluorescence spectra of the samples were obtained using a fluorescence spectrometer. The results indicated that the luminescence colors of both series remained yellow-green despite a slight variation in the luminescence spectra with changes in composition. Excitation at 358 nm led to the phosphor exhibiting a broad emission band with its peak at 500 nm, which corresponded to the energy level transition from 3P1 to 1S0. When monitoring at 500 nm, the strongest excitation peak occurred at 358 nm, representing the energy level transition from 1S0 to 3P1. Furthermore, a shoulder peak at 320 nm was observed, indicating a charge transfer band between O2- and Bi3+. Analysis of the spectral data for series Ⅰ suggested that the optimal doping amount of Bi3+ was x=0.006. In this matrix, the substitution of Ba2+ by Bi3+ introduced an unequal substitution, leading to the generation of Ba2+ vacancies or interstitial O2- within the lattice, which had a negative impact on the luminous intensity of the material. Co-doping with K+ acted as a charge compensator, effectively cancelling out the Ba2+ vacancies or interstitial O2- by generating interstitial K+ or oxygen vacancies. Consequently, this process reduced lattice distortion and improved luminescent intensity. Further analysis of the spectral data for series Ⅱ revealed that the fully charge-compensated phosphor sample exhibited luminescent intensity about 2.5 times higher than that of the sample without K+ doping. |
| Keywords: phosphor Ba2ZnGe2O7：Bi3+ luminescent properties optical properties |
| 投稿时间：2023-05-25 修订日期：2023-10-28 |
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| 周诗晖,王喆,张占辉.电荷补偿对Ba2ZnGe2O7：Bi3+荧光粉发光性质的影响[J].无机化学学报,2023,39(12):2311-2316. |
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