基于背光显示应用的高量子效率窄带绿光荧光粉Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)

Narrow band green phosphor Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)with high quantum efficiency for backlight display

目的:研究Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)荧光粉的发光性能以及在宽色域背光显示领域的应用前景。方法:采用高温固相法合成了Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)荧光粉,并对其物相结构、光致发光特性以及热稳定性进行了研究。结果:该荧光粉具有260~510 nm的宽激发带,最强的激发峰在蓝色光谱区,表明Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)绿光荧光粉可以被商用蓝光芯片有效激发。在紫外光和蓝光的激发下,样品表现出明亮的绿色发射,其拥有较窄的半高宽(FWHM=40.4 nm),较高的色纯度(75.85%)和量子效率(81.5%),计算得到的Huang-Rhys因子表明样品具有较低的电子-声子耦合强度以及较好的热稳定性。制备的LED器件,色域可达118.2%的NTSC。结论:Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)荧光粉在宽色域背光显示领域具有广阔的应用前景。

Aims:This paper aims to study the luminescence performance of Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)phosphor and its application prospects in the field of wide color gamut backlight display.Methods:Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)phosphor was synthesized by the high temperature solid state method.The phase structure,photoluminescence characteristics and thermal stability of Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)phosphor were studied.Results:The phosphor had a wide excitation band of 260~510 nm,with the strongest excitation peak in the blue spectral region,indicating that Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)green light phosphor could be effectively excited by commercial blue light chips.Under the excitation of ultraviolet and blue light,the sample exhibited bright green emission,with a narrow full width at half maximum(FWHM=40.4 nm),a high color purity(75.85%),and a high quantum efficiency(81.5%).The calculated Huang-Rhys factor indicated that the sample had low electron-phonon coupling strength and great thermal stability.The prepared LED device had a color gamut of up to 118.2%NTSC.Conclusions:Mg_(0.388)Al_(2.408)O_(4):Mn^(2+)phosphor has broad application prospects in the field of wide color gamut backlight display.