Chen Jian, Ma Hongyun, Liu Yangai
J Nanosci Nanotechnol. 2016 Apr;16(4):3506-10. doi: 10.1166/jnn.2016.11827.
A series of blue-emitting Mg2Al4Si5O18:Ce3+ phosphors were prepared via the conventional high temperature solid-state reaction method. The phase structure, photoluminescence (PL) properties, PL thermal stability, and fluorescence decay curves of the samples were investigated for the first time. Under excitation at 365 nm, the phosphor exhibited a broad band blue emission with peak at 440 nm, which was ascribed to the 4f --> 5d transition of Ce3+, and the color coordinate was (0.1602, 0.0849). When the temperature increased to 150 °C, the luminescence intensity of the Mg2Al4Si5O18:0.06Ce3+ phosphor was 55.73% of the initial value at room temperature. The activation energy ΔE was calculated to be 0.25 eV, which proved the good thermal stability of the sample. The energy transfer critical distance between Ce3+ ions in Mg2Al4Si5O18 host were also calculated. The above results indicate that the Mg2Al4Si5O18:Ce3+ is a promising candidate as a blue-emitting near ultraviolet convertible phosphor for application in white light emitting diodes (WLEDs).
通过传统高温固相反应法制备了一系列蓝色发光的Mg2Al4Si5O18:Ce3+荧光粉。首次研究了样品的相结构、光致发光（PL）性能、PL热稳定性和荧光衰减曲线。在365nm激发下，该荧光粉呈现出以440nm为峰值的宽带蓝色发射，这归因于Ce3+的4f→5d跃迁，其色坐标为(0.1602, 0.0849)。当温度升高到150℃时，Mg2Al4Si5O18:0.06Ce3+荧光粉的发光强度为室温下初始值的55.73%。计算得出激活能ΔE为0.25eV，这证明了样品具有良好的热稳定性。还计算了Mg2Al4Si5O18基质中Ce3+离子之间的能量转移临界距离。上述结果表明，Mg2Al4Si5O18:Ce3+作为一种用于白光发光二极管（WLED）的蓝色发光近紫外转换荧光粉具有很大的应用潜力。
