A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+ lead-free piezoelectric material with superior water resistance behavior
A highly efficient, orange light-emitting (K0.5Na0.5)NbO3:Sm3+/Zr4+ lead-free piezoelectric material with superior water resistance behavior
复制标题
DOI：
10.1039/c4tc02995j
复制
发表时间：
2015-05
影响因子：
6.4
通讯作者：
Qiwei Zhang;Ke Chen;Leilei Wang;Haiqin Sun;Xusheng Wang;Xihong Hao
中科院分区：
文献类型：
--
作者：
Qiwei Zhang;Ke Chen;Leilei Wang;Haiqin Sun;Xusheng Wang;Xihong Hao
基于稀土掺杂铁/压电材料的多功能发光材料因其在新型多功能器件中的潜在应用而备受关注。目前，制造这些具有高光致发光量子产率的材料仍然是一个挑战，可以与传统荧光粉获得的值相媲美。本文报道了一种高效的橙色发光材料，该材料基于Sm3+和Zr4+共掺杂的（K0.5Na0.5）NbO3 （KNN）基体，具有优异的耐水性。系统地研究了样品的相结构、组成、光致发光性能、热猝灭性能和耐水性能。通过引入Zr4+离子，观察到Sm3+的4G5/2→6H7/2跃迁引起的597 nm橙光发射显著增强，这可以用晶体场的交换电荷模型很好地解释。特别是在407 nm n-UV光激发下，（K0.5Na0.5）0.99 sm0.01 nb0.09 zr0.010 3组成的材料，经过80 h的水浸时间，光致发光量子产率高达53%，且耐水性能优异，几乎保持与浸前相同的发光强度。QY值可以与一些商业荧光粉相媲美，如Y2O2S/Y2O3:Eu3+。这些发现表明Sm3+/Zr4+共掺杂KNN材料在未来白光led和新型多功能器件中的应用潜力巨大。
Multifunctional luminescent materials based on rare earth doped ferro-/piezoelectrics have attracted much attention due to their potential applications in novel multifunctional devices. Currently, it remains a challenge to fabricate these materials with high photoluminescence quantum yields, comparable to values obtained for traditional phosphors. Herein, we reported a highly efficient, orange light-emitting material with a superior water resistance behavior based on a (K0.5Na0.5)NbO3 (KNN) matrix co-doped with Sm3+ and Zr4+. The phase structure, composition, photoluminescence properties, thermal quenching and water resistance behavior of the samples were systematically studied. A significantly enhanced orange light-emission at 597 nm originating from the 4G5/2 → 6H7/2 transition of Sm3+ was observed by the introduction of Zr4+ ions, which can be well explained by the exchange charge model of the crystal field. Particularly we achieve a photoluminescence quantum yield as high as 53% and superior water resistance property almost maintaining the same PL intensity as before immersion after 80 h water immersion time for the composition of (K0.5Na0.5)0.99Sm0.01Nb0.09Zr0.01O3 under 407 nm n-UV light excitation. The QY value can be comparable to some commercial phosphors, such as Y2O2S/Y2O3:Eu3+. These findings show the great potential of the Sm3+/Zr4+ co-doped KNN material for future applications in white LEDs and novel multifunctional devices.