Multi-peaked broad-band red phosphor Y3Si6N11:Pr3+ for white LEDs and temperature sensing
Multi-peaked broad-band red phosphor Y3Si6N11:Pr3+ for white LEDs and temperature sensing
复制标题
用于白光 LED 和温度传感的多峰宽带红色荧光粉 Y3Si6N11:Pr3
DOI：
10.1039/d0dt03532g
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发表时间：
2020-12-28
影响因子：
4
通讯作者：
Zhang, Jiahua
中科院分区：
文献类型：
--
作者：
Sun, Dashuai;Zhang, Liangliang;Zhang, Jiahua
LED照明中不可缺少的宽带红色荧光粉通常在650 nm以上的波长上表现出较长的发射尾巴，这消耗了激发能量，但对亮度的贡献很小。在这里，我们首次报道了Y3Si6N11中由于H-3(4)(930 cm(-1))和D-1(2)(725 cm(-1))能级的Stark分裂而形成的具有陡峭下降沿的652 nm宽的红色发射带，它是由Y3Si6N11中Pr3+的D-1(2)-&Gt；H-3(4)发射线组成的。红色发光显示出43 nm的带宽，这是迄今为止报道的Pr3+掺杂荧光粉中最宽的。将Y3Si6N11：Pr3+红色荧光粉应用于310 nm紫外光芯片白光LED的制备，在4188K的低相关色温下获得了96的高显色指数。此外，基于D-1(2)态的热耦合和大Stark分裂能级的发射线随温度变化的强度比，提出了一种温度传感方案。在93-473K温度范围内研究了Y3Si6N11：Pr3+的相对灵敏度。研究结果表明，Y3Si6N11：Pr3+是一种非常有吸引力的宽带红色荧光粉，可用于高显色性白色LED和温度传感应用。
The indispensable broad-band red phosphors for LED lighting generally show a long emission tail for wavelengths longer than 650 nm, which consumes excitation energy but contributes little luminance. Here, we report, for the first time, a broad red emission band with a steep falling edge at 652 nm, formed of widely distributed D-1(2) -> H-3(4) emission lines of Pr3+ in Y3Si6N11 due to a large Stark splitting of the H-3(4) (930 cm(-1)) and D-1(2) (725 cm(-1)) levels. The red emission exhibits a 43 nm bandwidth, which is the widest in Pr3+-doped phosphors reported so far. The red Y3Si6N11:Pr3+ phosphor was applied for the fabrication of 310 nm UV chip-based white LEDs, and a high color rendering index of 96 at a low correlated color temperature of 4188 K was achieved. Furthermore, a temperature-sensing scheme was proposed based on the temperature-dependent intensity ratios of the emission lines from the thermally coupled and large Stark splitting levels of the D-1(2) state. Relative sensitivities as a function of temperature were studied in the range of 93-473 K. The findings of this study indicate that Y3Si6N11:Pr3+ is an attractive broad-band red phosphor for both high color rendering white LEDs and temperature sensing applications.