Red fluorescent body and light-emitting device

Abstract

Provided is a red fluorescent body that is represented by general formula: MSiAlN3 (where M represents at least one element selected from Mg, Ca, Sr, and Ba), a portion of M being substituted with Eu,and that has, as a host crystal, the same crystal structure as that of the CaAlSiN3 crystal phase, wherein the red fluorescent body has a bulk density of 0.70-2.30 g / cm<3>. Also, provided is a light-emitting element having the red fluorescent body and a semiconductor light-emitting element capable of exciting the red fluorescent body.

Description

technical field

[0001] The present invention relates to a red phosphor for LED (Light Emitting Diode) or LD (Laser Diode), and a light emitting device using the red phosphor. Background technique

[0002] A white LED is a device that emits pseudo-white light by combining a semiconductor light emitting element and a phosphor, and a combination of a blue LED and a YAG yellow phosphor is known as a representative example thereof. However, although white LEDs of this type fall into the white region according to their chromaticity coordinate values, they have problems of low color rendering in lighting applications and poor color reproducibility in image display devices such as liquid crystal backlights due to insufficient red luminescent components. Therefore, in order to make up for the insufficient red light-emitting component, it has been proposed to use a nitride or oxynitride phosphor that emits red light together with a YAG phosphor (Patent Document 1).

[0003] As a nitr...

Examples

Embodiment 1

[0058] As the raw material of the phosphor of Example 1, α-type silicon nitride powder (Si 3 N 4 , Ube Industries, Ltd. SN-E10 grade), calcium nitride powder (Ca 3 N 2 , manufactured by Materion Corporation), aluminum nitride powder (AlN, Grade E manufactured by Tokuyama Corporation), europium oxide (Eu 2 o 3 , Shin-Etsu Chemical Industry Co., Ltd. RU grade).

[0059] First, Si in the raw material 3 N 4 , AlN, Eu 2 o 3 Dry mixing was performed with a V-blender for 10 minutes. In order to make the mixed raw materials uniform in size, the mixed raw materials were classified with a nylon sieve with a mesh size of 250 μm to prepare a raw material mixture.

[0060] The raw material mixture that has passed through the sieve is moved to a glove box capable of maintaining a nitrogen atmosphere of 1 mass ppm or less of moisture and 1 mass ppm of oxygen or less, in which Ca 3 N 2 Compounded into raw material mix, dry blended. In order to make the dry-blended raw materials un...

Embodiment 2

[0072] The phosphor powder of Example 2 was produced under the same conditions as in Example 1 except that the crushing and classification conditions were changed so as to be D10, D50 (mass median diameter), and D90 shown in Table 1. The properties of the phosphor obtained in Example 2 are shown in Table 1 together with the results of Example 1.

Embodiment 3

[0074] Grinding and classification conditions were changed so as to become D10, D50 (mass median particle size), and D90 shown in Table 1, and washing based on ethanol aqueous solution was added after acid washing, and prepared under the same conditions as in Example 1 except that Phosphor powder of Example 3. The characteristics of the phosphor obtained in Example 3 are also shown in Table 1 together.

technical field

[0001] The present invention relates to a red phosphor for LED (Light Emitting Diode) or LD (Laser Diode), and a light emitting device using the red phosphor. Background technique

[0002] A white LED is a device that emits pseudo-white light by combining a semiconductor light emitting element and a phosphor, and a combination of a blue LED and a YAG yellow phosphor is known as a representative example thereof. However, although white LEDs of this type fall into the white region according to their chromaticity coordinate values, they have problems of low color rendering in lighting applications and poor color reproducibility in image display devices such as liquid crystal backlights due to insufficient red luminescent components. Therefore, in order to make up for the insufficient red light-emitting component, it has been proposed to use a nitride or oxynitride phosphor that emits red light together with a YAG phosphor (Patent Document 1).

[0003] As a nitr...

Examples

Embodiment 1

[0058] As the raw material of the phosphor of Example 1, α-type silicon nitride powder (Si 3 N 4 , Ube Industries, Ltd. SN-E10 grade), calcium nitride powder (Ca 3 N 2 , manufactured by Materion Corporation), aluminum nitride powder (AlN, Grade E manufactured by Tokuyama Corporation), europium oxide (Eu 2 o 3 , Shin-Etsu Chemical Industry Co., Ltd. RU grade).

[0059] First, Si in the raw material 3 N 4 , AlN, Eu 2 o 3 Dry mixing was performed with a V-blender for 10 minutes. In order to make the mixed raw materials uniform in size, the mixed raw materials were classified with a nylon sieve with a mesh size of 250 μm to prepare a raw material mixture.

[0060] The raw material mixture that has passed through the sieve is moved to a glove box capable of maintaining a nitrogen atmosphere of 1 mass ppm or less of moisture and 1 mass ppm of oxygen or less, in which Ca 3 N 2 Compounded into raw material mix, dry blended. In order to make the dry-blended raw materials un...

Embodiment 2

[0072] The phosphor powder of Example 2 was produced under the same conditions as in Example 1 except that the crushing and classification conditions were changed so as to be D10, D50 (mass median diameter), and D90 shown in Table 1. The properties of the phosphor obtained in Example 2 are shown in Table 1 together with the results of Example 1.

Embodiment 3

[0074] Grinding and classification conditions were changed so as to become D10, D50 (mass median particle size), and D90 shown in Table 1, and washing based on ethanol aqueous solution was added after acid washing, and prepared under the same conditions as in Example 1 except that Phosphor powder of Example 3. The characteristics of the phosphor obtained in Example 3 are also shown in Table 1 together.

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