Down- and up-conversion photoluminescence of ZrO2:Ho3+ and ZrO2:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation
Down- and up-conversion photoluminescence of ZrO2:Ho3+ and ZrO2:Ho3+/Yb3+ coatings formed by plasma electrolytic oxidation
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DOI：
10.1016/j.jallcom.2019.01.280
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发表时间：
2019-05
影响因子：
6.2
通讯作者：
S. Stojadinović;N. Tadic;R. Vasilić
中科院分区：
文献类型：
--
作者：
S. Stojadinović;N. Tadic;R. Vasilić
本文分别研究了在含有Ho 2 O3和Ho 2 O3/Yb 2 O3颗粒的碱性电解液中，锆的等离子体电解氧化（PEO）过程中ZrO 2：Ho 3+和ZrO 2：Ho 3 +/Yb 3+涂层的形成。对薄膜的形貌、化学组成、相组成以及上下转换光致发光（PL）进行了研究。在280 nm光激发下，ZrO 2：Ho 3+的下转换发光光谱由ZrO 2基质的宽发光带和Ho 3+的f-f跃迁带组成。Ho ~（3+）在540 nm和550 nm附近的主要发光带分别归属于~ 5 F4 → ~ 5I 8和~ 5S 2 → ~ 5I 8跃迁。450 nm激光激发下转换发光强度（5I 8 → 5G 6跃迁）强烈依赖于掺Ho ~（3+）的浓度。也就是说，它取决于PEO过程的持续时间和电解质中Ho 2 O3颗粒的浓度。随着Ho 3+浓度的增加，荧光强度增加，最大Ho：Zr比约为18 <$10 − 3，当Ho 3+浓度越高，荧光强度越强。在980 nm激光二极管的激发下，ZrO 2：Ho 3 +/Yb 3+薄膜产生了较强的绿色（5 F4，5S 2 → 5I 8）、较弱的红色（5 F5 → 5I 8）和近红外（5 F4，5S 2 → 5I 7）上转换发光。随着Yb ~（3+）浓度的增加，发光强度增加，表明激发态Yb ~（3+）离子向Ho ~（3+）离子的能量转移效率较高。
This paper discusses ZrO2:Ho3+and ZrO2:Ho3+/Yb3+coating formation by the plasma electrolytic oxidation (PEO) of zirconium in alkaline electrolyte containing Ho2O3and Ho2O3/Yb2O3particles, respectively. The morphology, chemical and phase composition, as well as down- and up-conversion photoluminescence (PL) of the coatings, were investigated. Down-conversion PL emission spectra of ZrO2:Ho3+excited by 280 nm radiation are composed of broad PL band associated with ZrO2host and bands corresponding to f–f transitions of Ho3+. The main PL emission bands of Ho3+at around 540 nm and 550 nm are assigned to5F4→5I8and5S2→5I8transitions, respectively. The down-conversion PL intensity of ZrO2:Ho3+excited by 450 nm radiation (transition5I8→5G6) strongly depends on the concentration of Ho3+incorporated into ZrO2coatings. That is, it depends on the duration of the PEO process and concentration of Ho2O3particles in electrolyte. PL intensity increases with rising Ho3+concentration in ZrO2coatings, reaching a maximum Ho:Zr ratio of about 18⋅10−3and shows concentration quenching for higher values. Excitation of ZrO2:Ho3+/Yb3+coatings by 980 nm laser diode results in the appearance of a strong green (5F4,5S2→5I8), weaker red (5F5→5I8), and NIR (5F4,5S2→5I7) up-conversion emissions. An increase of the PL intensity with increasing Yb3+concentration indicates an efficient transfer of energy from excited Yb3+ions to Ho3+ions.