Eu~(3+)掺杂浓度对Gd_(6-x)WO_(12)∶xEu~(3+)红色荧光粉发光特性的影响
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摘要
采用高温固相法制备了Gd_(6-x)WO_(12)∶xEu~(3+)(x=0. 05,0. 1,0. 2,0. 3,0. 4,0. 5)红色荧光粉,并对此荧光粉的结构及发光性能进行了探讨。结果表明,其激发光谱分布在350～550 nm波长范围,较强谱峰位于395 nm、465 nm,可以被In Ga N管芯产生的360～480 nm辐射有效激发;在波长为395 nm近紫外光或者465 nm蓝光激发下,其发射光谱谱峰位于613 nm处。随着掺杂离子Eu~(3+)浓度x的增大,荧光粉荧光强度会随之增强,当强度达到最高时,Eu~(3+)掺杂浓度为x=0. 3,随着掺杂浓度x的进一步增大,强度逐渐降低,发生浓度猝灭。根据Dexter能量共振理论,其自身的浓度猝灭是由电偶极-电偶极相互作用引起的。
The Gd_(6-x)WO_(12):xEu~(3+)( x = 0. 05,0. 1,0. 2,0. 3,0. 4,0. 5) red phosphor was synthesized by high temperature solid state method. X-ray diffraction and fluorescence spectrophotometry were used to investigate the structural and luminescent properties of the Gd_(6-x)WO_(12): xEu~(3+)red phosphor. The result showed the excitation spectrum extended from 350 nm to 550 nm,and the peaks appeared around 395 nm and 465 nm. The phosphor can be excited effectively by In GaN chip in the range of 360 ～ 480 nm.Excited by 395 nm UV or 465 nm blue light,the peak of the emission spectrum appeared around 613 nm. The emission spectrum intensity firstly increased with Eu~(3+)doping concentration increasing,and then decreased. The strongest emission intensity was obtained when Eu~(3+)doping concentration reached 30 mol%. The concentration self-quenching was attributed to the d-d interaction according to the Dexter theory.
The Gd_(6-x)WO_(12):xEu~(3+)( x = 0. 05,0. 1,0. 2,0. 3,0. 4,0. 5) red phosphor was synthesized by high temperature solid state method. X-ray diffraction and fluorescence spectrophotometry were used to investigate the structural and luminescent properties of the Gd_(6-x)WO_(12): xEu~(3+)red phosphor. The result showed the excitation spectrum extended from 350 nm to 550 nm,and the peaks appeared around 395 nm and 465 nm. The phosphor can be excited effectively by In GaN chip in the range of 360 ～ 480 nm.Excited by 395 nm UV or 465 nm blue light,the peak of the emission spectrum appeared around 613 nm. The emission spectrum intensity firstly increased with Eu~(3+)doping concentration increasing,and then decreased. The strongest emission intensity was obtained when Eu~(3+)doping concentration reached 30 mol%. The concentration self-quenching was attributed to the d-d interaction according to the Dexter theory.
引文
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[3]XI L Q,PAN Y X,ZHU M M,et al.Room-temperature synthesis and optimized photoluminescence of a novel red phosphor Na KSn F6∶Mn4+for application in warm WLEDs[J].Journal of Materials Chemistry C,2017,5(36):9255-9263.
[4]LI K,SHANG M M,LIAN H Z,et al.Recent development in phosphors with different emitting colors via energy transfer[J].Journal of Materials Chemistry C,2016,4(24):5507-5530.
[5]YU Z,XIA Z G,CHEN M Y,et al.Insight into the preparation and luminescence properties of yellow-green-emitting[(Sr,Ba)3Al O4F-Sr3Si O5]∶Ce3+solid solution phosphors[J].Journal of Materials Chemistry C,2017,5(12):3176-3182.
[6]ZHAO J,GUO C F,LI T,et al.Synthesis,electronic structure and photoluminescence properties of Ba2Bi V3O11∶Eu3+red phosphor[J].Dyes Pigments,2016,132:159-166.
[7]LONG J Q,WANG Y Z,MA C Y,et al.Photoluminescence tuning of Ca8-xSrxMg Gd(PO4)7∶Eu2+,y Mn2+phosphors for applications in white LEDs with excellent color rendering index[J].RSCAdvance,2017,7(31):19223-19230.
[8]HUANG X Y,LI B,GUO H,et al.Molybdenum-doping-induced photoluminescence enhancement in Eu3+-activated Ca WO4redemitting phosphors for white light emitting diodes[J].Dyes Pigments,2017,143:86-94.
[9]WANG A W,LEE C,BIAN H D,et al.Synthesis of g-C3N4/silica gels for white-light-emitting devices[J].Particle and Particle Systems Characterization,2016,34:1600258.
[10]YU T T,SUN J S,HUA R N,et al.Luminescence of complex ion WO18-12in Dy3+doped nanocrystal Gd6WO12phosphor[J].Journal of Alloys and Compounds,2011,509(2):391-395.
[11]曹仕秀,韩涛,涂铭旌.Eu2+掺杂浓度对Ca2Mg Si2O7∶Eu2+荧光粉发光特性的影响[J].物理学报,2011,60(12):127802.
[12]DU P,GUO Y,SOO H L,et al.Broad near-ultraviolet and blue excitation band induced dazzling red emissions in Eu3+-activated Gd2Mo O6phosphors for white light-emitting diodes[J].RSCAdvance,2017,7(6):3170-3178.
[13]ZHOU J,XIA Z G,Marco B,et al.Photoluminescence tuning via energy transfer in Eu-doped Ba2(Gd,Tb)2Si4O13solid-solution phosphors[J].RSC Advances,2016,6(3):2046-2054.
[14]HUANG X Y,LI B,DU P,et al.Realizing highly efficient multicolor tunable emissions from Tb3+and Eu3+co-doped Ca Gd2(WO4)4phosphors via energy transfer by single ultraviolet excitation for lighting and display applications[J].Dyes Pigments,2018,151:202-210.
[15]ZHONG J S,XU M,CHEN D Q,et al.Novel red-emitting Sr2La Sb O6∶Eu3+phosphor with enhanced5D0→7F4transition for warm white light-emitting diodes[J].Dyes Pigments,2017,146:272-278.
[16]HUANG X Y,GUO H,LI B,et al.Eu3+-activated Na2Gd(PO4)(Mo O4):a novel high-brightness red-emitting phosphor with high color purity and quantum efficiency for white light-emitting diodes[J].Journal of Alloys and Compounds,2017,720(5):29-38.
[17]YUAN T,TIAN B,CHEN B J,et al.Morphological tuning and enhanced luminescence of Na Eu F4nano-/submicro-crystals[J].Applied Surface Science,2014,313(6):504-511.
[18]DU P,SU Y J.Eu3+-activated La2Mo O6-La2WO6red-emitting phosphors with ultrabroad excitation band for white light-emitting diodes[J].Scientific Reports,2017,7:11953.
[19]DU P,WU Y F,SU Y J,et al.Facile synthesis of bifunctional Eu3+-activated Na Bi F4red-emitting nanoparticles for simultaneous white light-emitting diodes and field emission displays[J].Chemical Engineering Journal,2018,337:91-100.
[20]Dexter D L,Schulman J H.Theory of concentration quenching in inorganic phosphor[J].The Journal of Chemical Physics,1954,22:1063-1070.
[21]项文斗,刘晓华,张伟,等.白光LED用钨酸盐红色荧光粉的制备及发光特性[J].化工新型材料,2011,39(8):85-88.
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[23]TIAN Y,CHEN B J,TIAN B,et al.Concentration-dependent luminescence and energy transfer of flower-like Y2(Mo O4)3∶Dy3+phosphor[J].Journal of Alloys and Compounds,2011,509(20):6096-6101.