Giant tunability of upconversion photoluminescence in Er3+-doped (K, Na)NbO3 single crystals

Perovskite oxides with luminescent ions hold great promise in optoelectronic devices because of their outstanding thermal stabilities and electro-optic performance. As one typical perovskite upconversion (UC) host material, lead-free potassium sodium niobate ((K, Na)NbO3/(KxNa1−x)NbO3 or KNN) has at...

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Published in:Nanoscale 2019-09, Vol.11 (36), p.16928-16934
Main Authors: Xue, Saidong, Deng, Hao, Xie, Qingxiu, Hu, Yuqing, Yan, Jianmin, Zhao, Xiangyong, Wang, Feifei, Zhang, Quan, Luo, Laihui, Deng, Chenguang, He, Chongjun, Lin, Di, Li, Song, Wang, Xi'an, Luo, Haosu
Format: Article
Language:English
Subjects:
Annealing
Conductivity
Crystal defects
Crystal growth
Lead free
Niobates
Optoelectronic devices
Organic chemistry
Oxygen
Perovskites
Photoluminescence
Single crystals
Sodium
Upconversion
Vacancies
Vacuum annealing
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container_end_page 16934
container_issue 36
container_start_page 16928
container_title Nanoscale
container_volume 11
creator Xue, Saidong
Deng, Hao
Xie, Qingxiu
Hu, Yuqing
Yan, Jianmin
Zhao, Xiangyong
Wang, Feifei
Zhang, Quan
Luo, Laihui
Deng, Chenguang
He, Chongjun
Lin, Di
Li, Song
Wang, Xi'an
Luo, Haosu
description Perovskite oxides with luminescent ions hold great promise in optoelectronic devices because of their outstanding thermal stabilities and electro-optic performance. As one typical perovskite upconversion (UC) host material, lead-free potassium sodium niobate ((K, Na)NbO3/(KxNa1−x)NbO3 or KNN) has attracted much attention in recent years. In the present work, a novel routine was developed to tune the upconversion photoluminescence (UC PL) performance by controlling the oxygen vacancy concentration in the KNN matrix, based on the 0.1% Er3+-doped KNN (Er-KNN) single crystals grown for the first time. UC PL properties, conductivity and defect chemistry of the single crystals were systematically investigated. The UC PL intensity of the as-grown Er-KNN material could be enhanced by 20 times after oxygen atmosphere annealing at 800 °C and fully quenched after vacuum annealing. What's more, by annealing under an oxygen atmosphere and vacuum, the conductivity of the Er-KNN sample was successfully tuned for more than 8 orders of magnitude. The super-wide range tunability of UC PL performance and conductivity could be explained by oxygen vacancies which gave rise to Nb5+–Nb4+ valence alternation. Because of the modulated photoluminescence properties and conductivity, our grown Er-KNN single crystals have great potential for use in multifunctional devices.
doi_str_mv 10.1039/c9nr05817f
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As one typical perovskite upconversion (UC) host material, lead-free potassium sodium niobate ((K, Na)NbO3/(KxNa1−x)NbO3 or KNN) has attracted much attention in recent years. In the present work, a novel routine was developed to tune the upconversion photoluminescence (UC PL) performance by controlling the oxygen vacancy concentration in the KNN matrix, based on the 0.1% Er3+-doped KNN (Er-KNN) single crystals grown for the first time. UC PL properties, conductivity and defect chemistry of the single crystals were systematically investigated. The UC PL intensity of the as-grown Er-KNN material could be enhanced by 20 times after oxygen atmosphere annealing at 800 °C and fully quenched after vacuum annealing. What's more, by annealing under an oxygen atmosphere and vacuum, the conductivity of the Er-KNN sample was successfully tuned for more than 8 orders of magnitude. The super-wide range tunability of UC PL performance and conductivity could be explained by oxygen vacancies which gave rise to Nb5+–Nb4+ valence alternation. 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source Royal Society of Chemistry:Jisc Collections:Royal Society of Chemistry Read and Publish 2022-2024 (reading list)
subjects Annealing
Conductivity
Crystal defects
Crystal growth
Lead free
Niobates
Optoelectronic devices
Organic chemistry
Oxygen
Perovskites
Photoluminescence
Single crystals
Sodium
Upconversion
Vacancies
Vacuum annealing
title Giant tunability of upconversion photoluminescence in Er3+-doped (K, Na)NbO3 single crystals
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