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首页> 外文期刊>Optical Materials >Luminescence properties of M_2MgSi_2O_7:Eu~(2+) (M = Ca, Sr) phosphors and their effects on yellow and blue LEDs for solid-state lighting
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Luminescence properties of M_2MgSi_2O_7:Eu~(2+) (M = Ca, Sr) phosphors and their effects on yellow and blue LEDs for solid-state lighting

机译：M_2MgSi_2O_7：Eu〜（2+）（M = Ca，Sr）荧光粉的发光特性及其对固态照明用黄色和蓝色LED的影响

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摘要

The akermanite phosphors of Eu~(2+) activated M_2MgSi_2O_7 (M = Ca, Sr) were synthesized by solid-state reactions under a weak reductive atmosphere, and systematically characterized by photoluminescence excitation and emission spectra, lifetime, concentration quenching, diffuse reflection spectra and thermal quenching process in the temperature range of 100-400 K. In Sr_2MgSi_2O_7:Eu~(2+) there are at least two distinguishable sites, resulting in one broad emission situating at about 450 nm and another dominating around 535 nm, and in Sr_2MgSi_2O_7:Eu~(2+) only a blue emission around 468 nm is observed. Both phosphors can be efficiently excited in the wavelength range of 250-425 nm where the near near UV (～395 nm) Ga(In)N LED is well matched. The lifetimes of Eu~(2+) ions in these samples are around microsecond. The concentration of Eu~(2+) ions in Ca analog is optimized at about 1.5 mol%. By combining M_2MgSi_2O_7:Eu~(2+) (M = Ca, Sr) phosphors with near UV Ga(In)N chips, intense yellowish-green (Ca) and blue LEDs (Sr) are obtained, respectively. The blue LED shows better stability on chromaticity and better saturation on luminous intensity as the direct current increases. Such difference is considered to be due to the different thermal effect on the peak position, luminescent intensity and full-width half-maximum (FWHM) of Eu~(2+) ions in M_2MgSi_2O_7 (M = Ca, Sr). These results show that M_2MgSi_2O_7:Eu~(2+) (M = Ca, Sr) phosphors exhibit potential applications in the field of white LEDs.
机译：Eu〜（2+）活化的M_2MgSi_2O_7（M = Ca，Sr）的钙钛矿荧光粉是通过在弱还原性气氛下的固相反应合成的，并系统地表征了光致发光的激发和发射光谱，寿命，浓度猝灭，漫反射光谱在100-400 K的温度范围内进行热淬火。在Sr_2MgSi_2O_7：Eu〜（2+）中，至少有两个可区分的位点，导致一个宽发射位于约450 nm，另一个位于535 nm附近。 Sr_2MgSi_2O_7：Eu〜（2+）仅观察到468 nm附近的蓝色发射。两种荧光粉都可以在250-425 nm的波长范围内被有效激发，其中近紫外（〜395 nm）Ga（In）N LED很好地匹配。这些样品中的Eu〜（2+）离子的寿命约为微秒。 Ca类似物中Eu〜（2+）离子的浓度被优化为约1.5mol％。通过将M_2MgSi_2O_7：Eu〜（2+）（M = Ca，Sr）荧光粉与近UV Ga（In）N芯片组合，分别获得了深黄绿色（Ca）和蓝色LED（Sr）。随着直流电流的增加，蓝色LED的色度稳定性更好，发光强度的饱和度更好。这种差异被认为是由于对M_2MgSi_2O_7（M = Ca，Sr）中Eu〜（2+）离子的峰位置，发光强度和半峰全宽（FWHM）的热效应不同所致。这些结果表明，M_2MgSi_2O_7：Eu〜（2+）（M = Ca，Sr）荧光粉在白光LED领域具有潜在的应用前景。

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