One Ion, Many Facets: Efficient, Structurally and Thermally Sensitive Luminescence of Eu2+ in Binary and Ternary Strontium Borohydride Chlorides
One Ion, Many Facets: Efficient, Structurally and Thermally Sensitive Luminescence of Eu2+ in Binary and Ternary Strontium Borohydride Chlorides
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DOI：
10.1021/acs.chemmater.9b03048
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发表时间：
2019-10
影响因子：
8.6
通讯作者：
Thomas Wylezich;A. Sontakke;V. Castaing;M. Suta;B. Viana;A. Meijerink;N. Kunkel
中科院分区：
文献类型：
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作者：
Thomas Wylezich;A. Sontakke;V. Castaing;M. Suta;B. Viana;A. Meijerink;N. Kunkel
用机械力化学合成法合成了掺Eu2+的混合碱金属氯化硼氢化锶Sr(BH4)3-xClx(A=K，Rb，Cs)和掺Eu2+的氯化硼氢化锶锶(BH4)2-xClx。在较短的球磨时间后，已经观察到锶(BH4)2-xClx(λem=457 nm)和钙钛矿型混合碱金属锶硼氢化物Asr(BH4)3-xClx(A=K，Rb，Cs)(λem=490 nm)的强烈蓝光发光。温度相关的发光测量表明，所有ASR(BH4)3-xClx(A=K，Rb，Cs)在500K之前都随着温度的升高而发生明显的蓝移，这种由结构弛豫引起的极大的蓝移以及振动诱导的发射带展宽可以作为温度传感的敏感响应信号，据我们所知，这种独特的行为到目前为止还没有在任何Eu2+掺杂的荧光粉中被报道。此外，明亮的发光、高的量子效率和很低的热量子数是非常重要的。
The Eu2+-doped mixed alkaline metal strontium borohydride chlorides ASr(BH4)3–xClx (A = K, Rb, Cs) and Eu2+-doped strontium borohydride chloride Sr(BH4)2–xClx have been prepared by mechanochemical synthesis. Intense blue photoluminescence for Sr(BH4)2–xClx (λem= 457 nm) and cyan photoluminescence for the perovskite-type mixed alkaline metal strontium borohydride chlorides ASr(BH4)3–xClx (A = K, Rb, Cs) (λem = 490 nm) is already observable after short milling times. Temperature dependent luminescence measurements reveal an appreciable blue shift with increasing temperature for all ASr(BH4)3–xClx (A = K, Rb, Cs) until 500 K. This extremely large shift, caused by structural relaxation, as well as the vibrationally induced emission band broadening can serve as a sensitive response signal for temperature sensing, and this unique behavior has, to the best of our knowledge, not been reported in any Eu2+ doped phosphor so far. Additionally, bright luminescence, high quantum efficiencies, and very low thermal quen...