Investigation of Highly Efficient Phosphors for Field Emission Displays

用于场发射显示器的高效荧光粉的研究

• 批准号: 08650985
• 负责人: YAMAMOTO Hajime
• 金额: $ 1.34万
• 依托单位: Tokyo University of Technology
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1996
• 资助国家: 日本
• 起止时间: 1996 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-08650985/
• 关键词: Field Emission Disnlave; Phosphors; Luminescence Efficiency; Mixed Valency; Electron TraDs; ImDuritv Doping; Charge Compensation; Planar Faults; ペロブスカイト型酸化物; 硫化亜鉛蛍光体; 格子欠陥; エネルギー伝達; トラップ準位; ペロブスカイト型化合物; 低速電子線; 電気抵抗; Ga含有酸化物

Field emission displays (FED) are new thin, flat displays, which can reproduce moving pictures with fast response. This work has explored phosphors, which can meet the requirements of low-voltage, high-density electron excitation ; I.e. sufficient electrical conductivity and ruggedness as well as high efficiency.(1) Oxides containing elements with mixed valency.It was found that partial substitution of Al with either Ga or In in green-emitting YィイD23ィエD2AlィイD25ィエD2OィイD212ィエD2 : Tb decreases electrical resistivity of the phosphor, resulting in suppression of electrical charging of the phosphor surface. Presumably mixed valency of such elements as Ga, In or Ti increases the oxygen vacancy concentration, leading to a decrease in the resistivity.(2) Mechanism of efficiency improvement by addition of a IIIb-group element.Addition of a IIIb-group element, e.g. Al, to a red-emitting phosphor SrTiOィイD23ィエD2 : Pr increases the luminescence efficiency by more than 200 times. This work has elucid … More ated two types of mechanism operating for this effect ; (a) charge compensation between PrィイD13ィエD1+ at SrィイD12ィエD1+ sites and AlィイD13ィエD1+ at TiィイD14ィエD1+ sites and (b) elimination of planar faults in SrTiOィイD23ィエD2, crystals (thin SrO layers) by formation of Sr-aluminates.An efficiency can be improved also in other compounds with planar faults, e.g. Ruddlesden-Popper phases. Similar Al-addition effect observed in SrInィイD22ィエD2OィイD24ィエD2 : PrィイD13ィエD1+ has been investigated based on the above consideration.(3) Feasibility of a conventional blue phosphor, ZnS : Ag, Al, as an FED phosphorA commercial CRT phosphor ZnS : Ag, Al has a high efficiency, but it shows considerable luminance saturation under high-density excitation. This work investigated traps, which possibly induce Auger process, the main nonradiative process. Optical measurements show that deep impurity levels by Ag and Al are responsible to the Auger process. The luminance saturation is, therefore, caused by the factor inherent to the material composition. Less

场致发射显示器（FED）是一种新型的薄型平板显示器，它能快速再现运动图像。本工作探索了能够满足低电压、高密度电子激发要求的荧光粉，即具有足够的导电性和耐用性以及高效率。(1)含有混合价元素的氧化物。发现在发绿光的Y_xD 23_xD 2Al_xD 25_xD 2 O_xD 212_xD 2：Tb中用Ga或In部分取代Al会降低磷光体的电阻率，导致磷光体表面的电荷被抑制。据推测，诸如Ga、In或Ti的元素的混合价增加了氧空位浓度，导致电阻率降低。(2)通过添加III b族元素提高效率的机理：向红色发光磷光体SrTiO_xD_23_xD_2：Pr中添加III b族元素（例如Al）使发光效率提高200倍以上。这项工作阐明了 ...更多信息 有两种类型的机制运作，为这一效果;（a）在Sr TiO_2 O_3 D_2 O_3 D_2 O_3 D_1+位的Pr TiO_2 O_3 D_2 D_2 D_1+与在Ti TiO_2 O_3 D_2 O_3 D_2 D_1+位的Al TiO_2 O_3 D_2 D_2 D_2 D_1+之间的电荷补偿和（B）SrTiO_2 O_3 D_2 O_3 D_2 D_2晶体中平面缺陷的消除在具有平面缺陷的其他化合物中，例如Ruddlesden-Popper相，也可以提高效率。基于上述考虑，研究了在SrIn双金属D22双金属D2 O双金属D24双金属D2：Pr双金属D13双金属D1+中观察到的类似Al添加效应。(3)传统蓝色荧光粉ZnS：Ag，Al作为FED荧光粉的可行性商用CRT荧光粉ZnS：Ag，Al具有高效率，但在高密度激发下显示出相当大的亮度饱和。本文研究了可能诱发主要非辐射过程俄歇过程的陷阱。光学测量表明，深杂质水平的Ag和Al是负责俄歇过程。因此，亮度饱和度是由材料成分固有的因素引起的。少

项目成果

S.Okamoto, H.Kobayashi and H.Yamamoto: "Enhancement effect on red emission from SrTiO_3:Pr^<3+> by Al addition" Journal of Applied Physics. (印刷中). (1999)

S.Okamoto、H.Kobayashi 和 H.Yamamoto：“添加 Al 对 SrTiO_3:Pr^<3+> 红光发射的增强作用”应用物理学杂志（1999 年出版）。

H.Matsukiyo,T.Suzuki & H.Yamamoto: "Factors Inducing Deterioration of InBO_3 : Tb by Electron Bombardment" Journal of the Electrochemical Society. 143,[5]. 1696-1699 (1996)

H.松清,T.铃木

H.Yamamoto and Y.Suda: "Luminescence of Rare-earth-activated Ga-containing Oxides by Low-energy Electron Excitation"Journal of SID(Society for Information Displays). 6/3. 177-179 (1998)

H.Yamamoto 和 Y.Suda：“低能电子激发稀土激活含镓氧化物的发光”SID（信息显示学会）杂志。

S.Okamoto,H.Kobayashi & H.Yamamoto: "Enhancement of Characteristic Red Emission from SrTiO_3:Pr^<3+> by Al Addition"Journal of Applied Physics. 86[10]. 5594-5597 (1999)

冈本南,小林H

H. Yamamoto and Y. Suda: "Luminescence of Rare-earth-activated Ga-containing Oxides by Low-energy Electron Excitation"Journal of SID. 6/3. 177-179 (1998)

H. Yamamoto 和 Y. Suda：“低能电子激发稀土激活含镓氧化物的发光”SID 杂志。