JP4752067B2 - Phosphor for light emitting diode - Google Patents

Phosphor for light emitting diode Download PDF

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JP4752067B2
JP4752067B2 JP2006248748A JP2006248748A JP4752067B2 JP 4752067 B2 JP4752067 B2 JP 4752067B2 JP 2006248748 A JP2006248748 A JP 2006248748A JP 2006248748 A JP2006248748 A JP 2006248748A JP 4752067 B2 JP4752067 B2 JP 4752067B2
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emitting diode
light emitting
phosphor
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健司 戸田
峰夫 佐藤
和義 上松
真一郎 高坂
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国立大学法人 新潟大学
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Description

本発明は、発光ダイオード用蛍光体に関する。   The present invention relates to a phosphor for a light emitting diode.

発光ダイオードは低消費電力、長寿命という優れた特性を持つことから信号機や照明器具など光源として利用され始めている。そして、青色発光ダイオードと黄色発光蛍光体ＹＡＧ：Ｃｅ３＋を組み合わせた白色発光ダイオードが開発されたことで、高出力の可視発光ダイオードの研究が多方面で進められている（例えば、特許文献１を参照）。
特開２００３−１０５３３６号公報 Light emitting diodes have begun to be used as light sources for traffic lights and lighting equipment because of their excellent characteristics of low power consumption and long life. The development of a white light-emitting diode that combines a blue light-emitting diode and a yellow light-emitting phosphor YAG: Ce 3+ has advanced research on a high-power visible light-emitting diode (see, for example, Patent Document 1). reference).
JP 2003-105336 A

しかし、ＹＡＧ：Ｃｅ３＋の発光色は緑がかった黄色であり、青色発光蛍光体で励起した場合に、色温度が高い冷たい白色光しか得られない。このため、紫外発光ダイオードの励起により三原色である青、緑、赤の発光色を有する蛍光体を組み合わせて、演色性の高い白色光を得る方法が検討されており、新たな発光ダイオード用蛍光体が求められていた。 However, the emission color of YAG: Ce 3+ is greenish yellow, and when excited with a blue-emitting phosphor, only cold white light with a high color temperature can be obtained. Therefore, a method for obtaining white light with high color rendering properties by combining phosphors having three primary colors of blue, green, and red by excitation of ultraviolet light emitting diodes has been studied. Was demanded.

そこで、本発明は上記問題点に鑑み、紫外発光ダイオードの励起により三原色のいずれかの発光を示す新規の発光ダイオード用蛍光体を提供することをその目的とする。   In view of the above problems, an object of the present invention is to provide a novel phosphor for a light emitting diode that emits light of one of the three primary colors by excitation of an ultraviolet light emitting diode.

上記課題を達成するため種々検討した結果、Ｎａ３ＹＳｉ２Ｏ７にＥｕ３＋をドープすることによって、近紫外光域の励起光によって赤色発光を示すことを見出し、本発明を完成させた。 As a result of various studies to achieve the above-mentioned problems, it was found that by doping Eu 3+ into Na 3 YSi 2 O 7 , red light was emitted by excitation light in the near ultraviolet region, and the present invention was completed.

すなわち、本発明の発光ダイオード用蛍光体は、一般式：Ｎａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７（０＜ｘ＜１）で表される組成からなることを特徴とする。 That is, the phosphor for a light-emitting diode of the present invention is characterized by having a composition represented by the general formula: Na 3 (Y 1-x Eu x ) Si 2 O 7 (0 <x <1).

また、Ｅｕの濃度が２０〜８０モル％であることを特徴とする。   Further, the Eu concentration is 20 to 80 mol%.

本発明によれば、紫外発光ダイオード又は青色発光ダイオードの励起により赤色域の発光を示す新規の発光ダイオード用蛍光体を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the novel fluorescent substance for light emitting diodes which shows light emission of a red region by excitation of an ultraviolet light emitting diode or a blue light emitting diode can be provided.

本発明の発光ダイオード用蛍光体は、一般式：Ｎａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７（０＜ｘ＜１）で表される組成からなる。すなわち、母体結晶Ｎａ３ＹＳｉ２Ｏ７（イットリウム珪酸ナトリウム）に発光イオンとしてＥｕ３＋を付活した構造を有している。 The phosphor for a light emitting diode of the present invention has a composition represented by the general formula: Na 3 (Y 1-x Eu x ) Si 2 O 7 (0 <x <1). That is, it has a structure in which Eu 3+ is activated as a luminescent ion in the base crystal Na 3 YSi 2 O 7 (sodium yttrium silicate).

原料としてＮａ２ＣＯ３、Ｙ２Ｏ３、ＳｉＯ２、Ｅｕ２Ｏ３を用い、これらの原料をＮａ２ＣＯ３：Ｙ２Ｏ３：ＳｉＯ２：Ｅｕ２Ｏ３＝３：（１−ｘ）：４：ｘのモル比で混合した後、空気中で1000℃以上で焼成を行うことで、単一相の一般式：Ｎａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７（０＜ｘ＜１）で表される組成の発光ダイオード用蛍光体を得ることができる。 Na 2 CO 3 , Y 2 O 3 , SiO 2 , Eu 2 O 3 were used as raw materials, and these raw materials were used as Na 2 CO 3 : Y 2 O 3 : SiO 2 : Eu 2 O 3 = 3: (1-x ): After mixing at a molar ratio of 4: x, firing is performed in air at 1000 ° C. or higher, so that a single-phase general formula: Na 3 (Y 1-x Eu x ) Si 2 O 7 (0 < A phosphor for a light emitting diode having a composition represented by x <1) can be obtained.

本発明の発光ダイオード用蛍光体は、近紫外域の394nmにＥｕ３＋の７Ｆ０→５Ｌ６の遷移による部分的に高い励起スペクトルのピークがあり、また、青色域の465nmにも部分的に高い励起スペクトルのピークがあり、赤色域の615nmにＥｕ３＋のｆ−ｆ遷移に伴うシャープな発光スペクトルを有する。発光色は深い赤色であり、紫外発光ダイオード又は青色発光ダイオードにより励起可能な赤色蛍光体として用いることができる。 The phosphor for a light emitting diode of the present invention has a partially high excitation spectrum peak due to the transition of Eu 3+ from 7 F 0 to 5 L 6 at 394 nm in the near ultraviolet region, and also partially at 465 nm in the blue region. Have a high emission spectrum peak and a sharp emission spectrum associated with the Eu 3+ ff transition at 615 nm in the red region. The emission color is deep red, and it can be used as a red phosphor that can be excited by an ultraviolet light emitting diode or a blue light emitting diode.

そして、本発明の発光ダイオード用蛍光体と、紫外発光ダイオード又は青色発光ダイオードとを組み合わせ、さらに、その他の発光色を有する蛍光体と組み合わせることで、高い演色性を有する白色光発光が可能になり、照明用発光ダイオード用の蛍光体として利用できる。   By combining the phosphor for a light emitting diode of the present invention with an ultraviolet light emitting diode or a blue light emitting diode, and further combining with a phosphor having another light emitting color, it becomes possible to emit white light having high color rendering properties. It can be used as a phosphor for a light emitting diode for illumination.

なお、Ｅｕ濃度が２０〜８０モル％のときに、比較的高強度の発光が見られることから、Ｅｕの濃度は２０〜８０モル％であることが好ましい。   In addition, when the Eu concentration is 20 to 80 mol%, relatively high intensity light emission is observed. Therefore, the Eu concentration is preferably 20 to 80 mol%.

本発明によれば、紫外発光ダイオード又は青色発光ダイオードの励起により赤色域の発光を示す新規の発光ダイオード用蛍光体を提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, the novel fluorescent substance for light emitting diodes which shows light emission of a red region by excitation of an ultraviolet light emitting diode or a blue light emitting diode can be provided.

なお、本発明は上記実施形態に限定されるものではなく、本発明の思想を逸脱しない範囲で種々の変形実施が可能である。   The present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

原料としてＮａ２ＣＯ３、Ｙ２Ｏ３、ＳｉＯ２、Ｅｕ２Ｏ３を用い、Ｅｕの濃度が１、５、２０、４０、６０、８０モル％になるようにそれぞれ秤量した。原料をアセトンで湿式混合した後、空気中で1200℃、６時間の条件で焼成を行った。 Na 2 CO 3 , Y 2 O 3 , SiO 2 , and Eu 2 O 3 were used as raw materials and weighed so that the Eu concentration would be 1, 5, 20, 40, 60, and 80 mol%. The raw material was wet-mixed with acetone and then fired in air at 1200 ° C. for 6 hours.

Ｅｕの濃度が１、５、２０、４０、６０、８０モル％のときの粉末Ｘ線回折（ＸＲＤ）パターンの測定結果を図１に示す。いずれのＥｕ濃度においても、単一相のＮａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７が得られたことが確認された。 The measurement results of the powder X-ray diffraction (XRD) pattern when the Eu concentration is 1, 5, 20, 40, 60, and 80 mol% are shown in FIG. It was confirmed that single-phase Na 3 (Y 1-x Eu x ) Si 2 O 7 was obtained at any Eu concentration.

また、励起スペクトルと蛍光スペクトルの測定結果を図２に示す。近紫外域の394nmと青色域の465nmに部分的に高い励起スペクトルのピークがあり、赤色域の615nmにシャープな発光スペクトルが見られた。その発光色は深い赤色であり、紫外発光ダイオード又は青色発光ダイオードにより励起可能な赤色蛍光体として用いることができることが確認された。   Moreover, the measurement result of an excitation spectrum and a fluorescence spectrum is shown in FIG. There was a peak of a partially high excitation spectrum at 394 nm in the near ultraviolet region and 465 nm in the blue region, and a sharp emission spectrum was observed at 615 nm in the red region. Its emission color is deep red, and it was confirmed that it can be used as a red phosphor that can be excited by an ultraviolet light emitting diode or a blue light emitting diode.

さらに、Ｅｕ濃度と394nmにおける蛍光スペクトルの発光強度の関係を図３に示す。Ｅｕ濃度が２０〜８０モル％のときに、比較的高強度の発光が見られた。   Furthermore, the relationship between the Eu concentration and the emission intensity of the fluorescence spectrum at 394 nm is shown in FIG. When the Eu concentration was 20 to 80 mol%, relatively high intensity luminescence was observed.

実施例１で得られたＮａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７のＸＲＤパターンである。 2 is an XRD pattern of Na 3 (Y 1-x Eu x ) Si 2 O 7 obtained in Example 1. FIG. 実施例１で得られたＮａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７の励起発光スペクトルである。 2 is an excitation emission spectrum of Na 3 (Y 1-x Eu x ) Si 2 O 7 obtained in Example 1. 実施例１で得られたＮａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７のＥｕ濃度と394nmにおける蛍光スペクトルの発光強度の関係を示すグラフである。4 is a graph showing the relationship between the Eu concentration of Na 3 (Y 1-x Eu x ) Si 2 O 7 obtained in Example 1 and the emission intensity of the fluorescence spectrum at 394 nm.

Claims (2)

一般式：Ｎａ３（Ｙ１−ｘＥｕｘ）Ｓｉ２Ｏ７（０＜ｘ＜１）で表される組成からなることを特徴とする発光ダイオード用蛍光体。 A phosphor for a light-emitting diode, characterized by comprising a composition represented by the general formula: Na 3 (Y 1-x Eu x ) Si 2 O 7 (0 <x <1). Ｅｕの濃度が２０〜８０モル％であることを特徴とする請求項１記載の発光ダイオード用蛍光体。 2. The phosphor for light emitting diode according to claim 1, wherein the concentration of Eu is 20 to 80 mol%.
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JP5677463B2 (en) * 2010-11-30 2015-02-25 パナソニック株式会社 Phosphor and light emitting device
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CN103275718A (en) * 2013-06-18 2013-09-04 中国地质大学（北京） Green light type silicate fluorescent powder and preparation method thereof
CN103614140B (en) * 2013-11-27 2015-05-27 中南大学 Method for preparing Na3YSi2O7-based rare-earth ion activated fluorescent material
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JP2001181627A (en) * 1999-12-24 2001-07-03 Sumitomo Chem Co Ltd Fluorescent material for light-emitting element excitable by vacuum ultraviolet ray
AU2003227263A1 (en) * 2002-03-28 2003-10-13 Hitachi Chemical Co., Ltd. Phosphor and phosphor composition containing the same
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