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Eu掺杂KNN陶瓷的制备及可调性发光研究
作者姓名:WANG Meng-Hui  SHEN Hui  TIAN Tian  XIAN Qin  XU Jia-Yue  JIN Min  JIA Run-Ping
作者单位:1. 上海应用技术大学 材料科学与工程学院, 上海201418
2. 山东大学 晶体材料国家重点实验室, 济南250100
3. 上海电机学院 材料科学与工程学院, 上海201306
基金项目:National Natural Science Foundation of China(61605116,51972213);Science and Technology Commission of Shanghai Municipality(15ZR1440600,15520503400)。
摘    要:稀土离子掺杂铁电陶瓷是一类新型光致变色材料, 在光开关、光信息存储等领域具有潜在应用价值。本研究采用水热法制备了(K0.5 Na0.5)1-xEuxNbO3(KNN:xEu)前驱体粉体, 随后利用高温烧结得到对应陶瓷样品。在465 nm激发下, 观察到615 nm处有强的红色发光, 对应于Eu 3+5D07F2跃迁。通过紫外光照射, KNN:Eu陶瓷从乳白色变为深灰色。随后经过200 ℃加热10 min, 着色陶瓷又变回到初始颜色, 显示出良好的光致变色行为。紫外照射和反复加热循环可以有效调控该陶瓷的发光强度。且经过多次循环之后, 发光强度没有明显衰减。在紫外光照射下, KNN:0.06Eu陶瓷发光强度的可调比(ΔRt)高达83.9%, 说明发光具有良好的可调性。进而结合发光中心和色心之间的能量转移, 对KNN:Eu陶瓷的光致变色和发光机理进行了解释。

关 键 词:K0.5Na0.5NbO3(KNN)  发光  光致变色  
收稿时间:2019-03-12
修稿时间:2019-04-29

Preparation and Tunable Luminescence of Eu Doped KNN Ceramics
WANG Meng-Hui,SHEN Hui,TIAN Tian,XIAN Qin,XU Jia-Yue,JIN Min,JIA Run-Ping.Preparation and Tunable Luminescence of Eu Doped KNN Ceramics[J].Journal of Inorganic Materials,2020,35(2):236-242.
Authors:WANG Meng-Hui  SHEN Hui  TIAN Tian  XIAN Qin  XU Jia-Yue  JIN Min  JIA Run-Ping
Affiliation:1. School of Materials Science and Engineering, Shanghai Institute of Technology, Shanghai 201418, China
2. State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, China
3. School of Materials Science and Engineering, Shanghai Dianji University, Shanghai 201306, China
Abstract:Rare-earth doped inorganic ferroelectrics are considered as novel photochromic materials, with potential applications for optical switch and information storage (K0.5Na0.5)1-xEuxNbO3 (KNN:xEu) ceramics were prepared by high temperature calcination, with precursor powder obtained by hydrothermal method. Strong red emission at 615 nm was observed which corresponds to the 5D07F2 transition of Eu 3+ under excitation of 465 nm. Under UV light irradiation for 3 min, the color of the ceramics turned from milky white to dark gray. The colored samples returned to the original color when heated at 200 ℃ for 10 min, showing strong photochromic behavior. Meanwhile, the luminescence intensity of Eu 3+ can be tuned without obvious degradation by alternating UV light and heat stimulus. Upon UV light irradiation, large luminescence modulation ratio (ΔRt) up to 83.9% was achieved for KNN:0.06Eu, indicating good luminescence switching behavior. A possible mechanism for non-radiative energy transfer from the luminescent center to the color center was proposed according to their luminescent behavior.
Keywords:K0  5Na0  5NbO3(KNN)  luminescence  photochromism  
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