Blue-green light photochromism in europium doped BaMgSiO4
Blue-green light photochromism in europium doped BaMgSiO4
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DOI：
10.1063/1.3509417
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发表时间：
2010-11
影响因子：
4
通讯作者：
M. Akiyama
中科院分区：
文献类型：
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作者：
M. Akiyama
BaMgSiO_4（BMS）通过掺杂Eu，可以被探测到蓝光（波长λ=405 nm）。Eu掺杂的BMS变成亮粉色，并且在几秒内被绿色光（λ=475-532 nm）照射而漂白。着色-脱色过程是可重复的和第一次。显色状态在480小时（20天）内几乎不发生变化，即使在100 °C下也保持稳定。蓝绿光光致变色的机理是掺杂Eu与氧缺陷之间的电子转移。Eu的掺杂拓宽了BMS的吸收带，并提供了激发电子。氧缺陷形成电子陷阱，捕获激发的电子，并成为类F色心。
BaMgSiO4 (BMS) can be sensed to blue light (wavelength λ=405 nm) by doped europium (Eu). Eu doped BMS turns to bright pink, and is bleached by green light (λ=475–532 nm) irradiation in several seconds. The coloration-decoloration process is repeatable and first. The colored state hardly changes for over 480 h (20 days), and is stable even at 100 °C. The blue-green light photochromism can be explained by electron transfers between doped Eu and oxygen defects. The doped Eu broadens the absorption band of BMS, and supplies excited electrons. The oxygen defects form electron traps, which catch excited electrons, and become F-like color centers.