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Room-Temperature Large and Reversible Modulation of Photoluminescence by in Situ Electric Field in Ergodic Relaxor Ferroelectrics
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acsami.7b09354 Hailing Sun 1 , Xiao Wu 1 , Deng Feng Peng 1 , K. W. Kwok 1
ACS Applied Materials & Interfaces ( IF 8.3 ) Pub Date : 2017-09-21 00:00:00 , DOI: 10.1021/acsami.7b09354 Hailing Sun 1 , Xiao Wu 1 , Deng Feng Peng 1 , K. W. Kwok 1
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Ferroelectric oxides with luminescent ions hold great promise in future optoelectronic devices because of their unique photoluminescence and inherent ferroelectric properties. Intriguingly, the photoluminescence performance of ferroelectric ceramics could be modulated by an external electric field. However, researchers face a current challenge of the diminutive extent and degree of reversibility of the field-driven modification that hinder their use in room-temperature practical applications. Within the scope of current contribution in rare-earth-doped bismuth sodium titanate relaxors, the most important information to be noted is the shifting of the depolarization temperature toward room temperature and the resulting considerable enhancement in ergodicity, as evidenced by the dielectric properties, polarization, and strain hysteresis, as well as the in situ Raman/X-ray diffraction studies. After the introduction of 1 mol % Eu, the induced composition and charge disorders disrupt the original long-range ferroelectric macrodomains into randomly dynamic and weakly correlated polar nanoregions, which facilitates a reversible transformation between polar nanoregions and unstable ferroelectric state under an electric field, engendering a large strain. By virtue of this, both the extent and degree of reversibility of photoluminescence modulation are enhanced (∼60%) considerably, and room-temperature in situ tunable photoluminescence response is then achieved under electric field. These should be helpful for the realization of regulating the physical couplings (photoluminescent-ferroelectrics) in multifunctional inorganic ferroelectrics with a high ergodic state by reversibly tuning the structural symmetry.
中文翻译：
遍历弛豫铁电体中原位电场的室温大且可逆的光致发光调制
具有发光离子的铁电氧化物由于其独特的光致发光和固有的铁电特性，在未来的光电器件中具有广阔的前景。有趣的是，铁电陶瓷的光致发光性能可以通过外部电场来调节。但是，研究人员面临着目前的挑战，即场驱动修饰的可逆性的微小程度和可逆性使其无法在室温实际应用中使用。在稀土掺杂钛酸钠铋弛豫剂的电流贡献范围内，要注意的最重要信息是去极化温度向室温的偏移以及由此引起的遍历性的显着提高，这由介电特性，极化证明和应变磁滞，以及原位拉曼/ X射线衍射研究。引入1 mol％Eu后，诱导的组成和电荷紊乱将原始的长距离铁电宏观域破坏为随机动态且弱相关的极性纳米区域，从而促进了极性纳米区域与电场作用下不稳定的铁电状态之间的可逆转变，从而导致很大的压力。借助于此，光致发光调制的可逆性的程度和程度都得到了显着提高（〜60％），然后在电场下实现了室温下的原位可调光致发光响应。
更新日期：2017-09-21
中文翻译：
遍历弛豫铁电体中原位电场的室温大且可逆的光致发光调制
具有发光离子的铁电氧化物由于其独特的光致发光和固有的铁电特性，在未来的光电器件中具有广阔的前景。有趣的是，铁电陶瓷的光致发光性能可以通过外部电场来调节。但是，研究人员面临着目前的挑战，即场驱动修饰的可逆性的微小程度和可逆性使其无法在室温实际应用中使用。在稀土掺杂钛酸钠铋弛豫剂的电流贡献范围内，要注意的最重要信息是去极化温度向室温的偏移以及由此引起的遍历性的显着提高，这由介电特性，极化证明和应变磁滞，以及原位拉曼/ X射线衍射研究。引入1 mol％Eu后，诱导的组成和电荷紊乱将原始的长距离铁电宏观域破坏为随机动态且弱相关的极性纳米区域，从而促进了极性纳米区域与电场作用下不稳定的铁电状态之间的可逆转变，从而导致很大的压力。借助于此，光致发光调制的可逆性的程度和程度都得到了显着提高（〜60％），然后在电场下实现了室温下的原位可调光致发光响应。
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