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首页> 外文期刊>Japanese journal of applied physics >Comparison of Brightness of Emitting Semiconductor Nanocrystals with That of Rare-Earth Phosphor
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Comparison of Brightness of Emitting Semiconductor Nanocrystals with That of Rare-Earth Phosphor

机译：发光半导体纳米晶体与稀土荧光粉的亮度比较

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摘要

A method was developed to compare the brightness of newly developed thin films with dispersed photoluminescent CdTe semiconductor nanocrystals (NCs) at an ultimately high concentration (ca. 0.01 M) with that of a typical commercial rare-earth phosphor (Y_2O_2S:Eu). We have found it is reasonable to compare their brightness under conditions of the same sample thickness, excitation intensity, and wavelength. At the weak-excitation limit, the brightness of the new films was about 30 times higher. This higher brightness is due to the higher concentration and emission efficiency of NCs, and the larger absorption cross section per unit volume of NCs. The difference in the brightness increases with the excitation intensity because rare-earth phosphors exhibit a strong saturation phenomenon due to their long emission decay time. Because these films are efficiently excited by UV-blue diodes, the power of which is steadily increasing, they will become more applicable in future.
机译：开发了一种方法，用于比较最终分散的光致发光CdTe半导体纳米晶体（NCs）最终高浓度（约0.01 M）与典型的商用稀土荧光粉（Y_2O_2S：Eu）的亮度。我们发现在相同样品厚度，激发强度和波长的条件下比较它们的亮度是合理的。在弱激发极限下，新膜的亮度约高30倍。这种较高的亮度是由于NCs的浓度和发射效率更高，以及每单位体积NCs的吸收截面更大。亮度的差异随着激发强度的增加而增加，因为稀土磷光体由于其长的发射衰减时间而表现出强烈的饱和现象。由于这些薄膜被紫外-蓝色二极管有效地激发，其功率在不断增加，因此它们将来将变得更加适用。

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