通过SiO_2涂层改善BaSi_2O_2N_2∶Eu~(2+)荧光粉的热性能（英文）
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摘要
本文研究了SiO_2涂层对BaSi_2O_2N_2∶Eu~(2+)蓝绿色荧光粉发光性能和热性能的影响。采用溶胶-凝胶法制备了SiO_2包覆的BaSi_2O_2N_2∶Eu~(2+)蓝绿色荧光粉。实验结果表明,最佳镀膜量为6wt%,当镀膜量大于此值时,荧光粉亮度迅速降低。涂覆SiO_2后,在150℃下BaSi_2O_2N_2∶Eu~(2+)荧光粉的热猝灭性能提高了2. 4%,在500℃热降解后荧光粉的发光性能提高了15%。SiO_2涂层显著提高了BaSi_2O_2N_2∶Eu~(2+)荧光粉的热稳定性。SiO_2涂层的作用机理是在荧光粉表面和氧化气氛之间形成阻挡层,保护Eu~(2+)的发光中心在热加热过程中不被氧化。
In this paper, the effect of SiO_2 coating on the luminescence and thermal properties of BaSi_2 O_2 N_2∶ Eu~(2+)blue-green phosphors was investigated. The BaSi_2 O_2 N_2∶ Eu~(2+)blue-green phosphor was coated with SiO_2 by sol-gel method. The experimental results show that the optimal coating amount is6 wt%,the phosphor brightness is rapidly decrease when the amount larger than this value. After coating SiO~(2+)2,the thermal quenching performance of BaSi_2 O_2 N_2∶ Euphosphor at 150 ℃ was increased by 2. 4%,and the luminescence performance of the phosphor after thermal degradation at 500 ℃ was increased by15%. SiO_2 coating significantly improves the thermal stability of BaSi_2 O_2 N_2∶ Eu~(2+)phosphors. The mechanism of SiO_2 coating is that a blocking layer is formed between the surface of the phosphor and the oxidizing atmosphere protects the luminescent center of Eu~(2+)from being oxidizing during thermal heating.
In this paper, the effect of SiO_2 coating on the luminescence and thermal properties of BaSi_2 O_2 N_2∶ Eu~(2+)blue-green phosphors was investigated. The BaSi_2 O_2 N_2∶ Eu~(2+)blue-green phosphor was coated with SiO_2 by sol-gel method. The experimental results show that the optimal coating amount is6 wt%,the phosphor brightness is rapidly decrease when the amount larger than this value. After coating SiO~(2+)2,the thermal quenching performance of BaSi_2 O_2 N_2∶ Euphosphor at 150 ℃ was increased by 2. 4%,and the luminescence performance of the phosphor after thermal degradation at 500 ℃ was increased by15%. SiO_2 coating significantly improves the thermal stability of BaSi_2 O_2 N_2∶ Eu~(2+)phosphors. The mechanism of SiO_2 coating is that a blocking layer is formed between the surface of the phosphor and the oxidizing atmosphere protects the luminescent center of Eu~(2+)from being oxidizing during thermal heating.
引文
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[2] Cheng C,Lei Y,Liu Z Q,et al. Performance improvement of light emitting diodes with double superlattices confinement layer[J]. Journal of Semiconductors,2018,39(11):114005.
[3] Liang C,You H P,Fu Y B,et al. A novel tunable blue-green-emitting CaGdGaAl2O7∶Ce3+,Tb3+phosphor via energy transfer for UV-exited white LEDs[J]. Dalton Trans.,2015,44:8100.
[4] Philipp P,Volker W,Cora H,et al. Narrow band red emitting Sr[Li Al3N4]∶Eu2+as a next generation LED phosphor material[J]. Nature Materials,2014,12:1.
[5] He J H,Fu Y B,Liang C L,et al. Effects of trace elements doping on the long-term performance of red phosphor(Sr,Ca)Al SiN3∶Eu2+used for WLED[J]. Chin. J. Lumin.,2015,36(3):257.
[6] Joshi B,Kshetri Y K,Gyawal G,et al. Transparent Mg-α/β-Sialon∶Eu2+ceramics as a yellow phosphor for Pc-WLED[J]. J. Alloys Comp.,2015,631:38.
[7] Yoshimura K,Fukunaga H,Izumi M,et al. Achieving superwide-color-gamut display by using narrow-band green-emittingΓ-Alon:Mn,Mg phosphor[J]. Japanese Journal of Applied Physics,2017,56(4):041701.
[8] Liu L H,Xie R J,Hirosaki N,et al. Photoluminescence properties ofΒ-SIALON∶Yb2+,a Novel green-emitting phosphor for white light-emitting diodes[J]. Science and Technology of Advanced Materials,2016,12(3):034404.
[9] Xie R J,Hirosaki N,Sakuma K,et al. White light-emitting diodes(Leds)using(oxy)nitride phosphors[J]. Journal of Physics D:Applied Physics,2008,41(14):144013.
[10] Yamada S,Emoto H,Ibukiyama M,et al. Properties of sialon powder phosphors for white LEDs[J]. Journal of the European Ceramic Society,2012,32(7):1355.
[11] Shioi K,Michiue Y,Hirosaki N,et al. Synthesis and photoluminescence of a novel Sr-Sialon∶Eu2+blue-green phosphor(Sr14Si68-SAl6+SOs N106-S∶Eu2+(S≈7))[J]. Journal of Alloys and Compounds,2011,509(2):332.
[12] Xie R J,Hirosaki N,Li H L,et al. Synthesis and photoluminescence properties ofΒ-Sialon∶Eu2+(Si6-ZAlZOZN8-Z∶Eu2+)[J]. Journal of The Electrochemical Society,2007,154(10):J314.
[13] Seibald M,Rosenthal T,Oeckler O,et al. Unexpected luminescence properties of Sr(0. 25)Ba(0. 75)Si2O2N2∶Eu2+-a narrow blue emitting oxonitridosilicate with cation ordering[J]. Chemistry,2012,18(42):13446.
[14] Yang Z X,Li J T,Yang G T,et al. Synthesis of Eu2+doped SrSi2O2N2and Sr0. 37Ba0. 6Si2O2N2phosphor and their application for LED[J]. J.Chin. Ceram. Soc.,2015,43(12):1777.
[15] Zhuang Y X,Lv Y,Wang L,et al. Trap depth engineering of Sr Si2O2N2∶Ln3+persistent luminescence materials for information storage applications[J]. ACS Appl. Mater. Interfaces. 2018 10(2):1854.
[16] Wang B,Chen J,Xia Y,et al. Enhancement of Photoluminescence in BaSi2O2N2∶Eu2+by Partial Ge4+Substitution for Si4+[J]. J. Nanosci.Nanotechnol.,2016,16(4):3608-3612.
[17] Wang L,Ni H,Zhang Q,et al. Research on the Luminescence and Temperature Quenching Properties of BaSi2O2N2∶Eu2+Phosphor.[J].Journal of Nanoscience&Nanotechnology,2016,16(4):4008-4011.
[18] Wang C Y,Xie R J,Li F,et al. Thermal degradation of the green-emitting SrSi2O2N2∶Eu2+phosphor for solid state lighting[J]. Journal of Materials Chemistry C,2014,2(15):2735-2742.
[19] Wang C Y,Xie R J,Li F Z,et al. Thermal degradation of the green-Emitting SrSi2O2N2∶Eu2+phosphor for solid state lighting[J]. J. Mater.Chem. C,2014,2(15):2735.