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首页> 外文期刊>The journal of physical chemistry, C. Nanomaterials and interfaces >Bright and High-Color-Rendering White Light-Emitting Diode Using Color-Tunable Oxychloride and Oxyfluoride Phosphors
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Bright and High-Color-Rendering White Light-Emitting Diode Using Color-Tunable Oxychloride and Oxyfluoride Phosphors

机译：使用可调色的氯氧化物和氟氧化物荧光粉的高亮度和高显色性的白色发光二极管

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White lighting converted by tricolor phosphor and near-ultraviolet light-emitting diode demonstrates great potential in general lighting. However, a major.problem with this approach is the lower luminous efficiency of the resulting white lighting by the reabsorption among tricolor phosphors. In this work, we propose a general but effective method for achieving high-efficacy white light-emitting diodes (WLEDs) by using two-color phosphors having the same host that can lower energy loss by reabsorption. Color-tunable Sr7.95Si4O12Cl8:0.05Eu(2+) (SSO_Cl:0.05Eu(2+)) phosphors are synthesized by cationic substitution Strategy, and the emission colors can be tuned from blue-greenish to blue/yellow by Sr -> Mg/Ca Substitution. The red-shifted emission is attributed to the increased Eu2+ d-orbital splitting owing to the smaller size of Ca2+, whereas blue-shifted Eu2+ emission is unusual in Mg-substitution for Sr2+. WLEDs with luminous efficacies (eta(L)) of 28.9-56 lm/W and CRIs of 79-90.2 are demonstrated using the two-color phosphors. By employing a narrow-line Mn4+ emission deep red oxyfluoride phosphor, a high CRI (Ra = 90.3, R9 = 94) WLED with eta(L) of 39.3 lm/W is obtained. These findings provide a possible way for developing high CRI WLED by using two-color phosphors.
机译：由三色磷光体和近紫外发光二极管转换而成的白色照明在一般照明中显示出巨大的潜力。然而，这种方法的主要问题是三色磷光体之间的重吸收导致所得白色照明的发光效率较低。在这项工作中，我们提出了一种通用而有效的方法，该方法通过使用具有相同主体的双色荧光粉来实现高效率的白光发光二极管（WLED），该荧光粉可以通过重吸收来降低能量损失。颜色可调的Sr7.95Si4O12Cl8：0.05Eu（2+）（SSO_Cl：0.05Eu（2+））荧光粉是通过阳离子取代策略合成的，发射色可以通过Sr从蓝绿色调为蓝/黄色->镁/钙替代。红移的发射归因于由于Ca2 +的尺寸较小而增加的Eu2 + d轨道分裂，而蓝移的Eu2 +发射在Sr2 +的Mg替代中不常见。使用双色荧光粉证明了具有28.9-56 lm / W的发光效率（eta（L））和79-90.2的CRI的WLED。通过使用窄线Mn4 +发射深红色的氟化氧磷光体，可获得eta（L）为39.3 lm / W的高CRI（Ra = 90.3，R9 = 94）WLED。这些发现为使用双色荧光粉开发高CRI WLED提供了一种可能的方法。

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