Light source device, projector, and vehicle
A light source device includes: an excitation light source that emits excitation light having an energy density of 10 W/mm 2 or more; and a phosphor layer that has phosphor particles embedded in the matrix. The phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2). Y 3-x1-y1 R 1 y1 Ce x1 Al 5-z1 Ga z1 O 12 (1) Y 3-x2-y2 R 2 y2 Ce x2 Al 5-z2 Sc z2 O 12 (2) In the formula (1), R 1 includes at least one selected from the group consisting of Gd and Tb, and x 1 , y 1 , and z 1 satisfy 0.003≤x 1 ≤0.03, 0≤y 1 ≤2.1, and 0≤z 1 ≤2.2, respectively. In the formula (2), R 2 includes at least one selected from the group consisting of Gd and Tb, and x 2 , y 2 , and z 2 satisfy 0.003≤x 2 ≤0.03, 0≤y 2 ≤2.1 and 0≤z 2 ≤1.5, respectively.
1. A light source device comprising:
an excitation light source that emits excitation light having an energy density of 10 W/mm 2 or more; and
a phosphor layer that includes a matrix and phosphor particles embedded in the matrix, wherein the phosphor particles include at least one selected from the group consisting of metal oxides represented by a following formula (1) and metal oxides represented by a following formula (2),
Y 3-x1-y1 R 1 y1 Ce x1 Al 5-z1 Ga z1 O 12 (1)
Y 3-x2-y2 R 2 y2 Ce x2 Al 5-z2 Sc z2 O 12 (2)
where, in the formula (1), R 1 includes at least one selected from the group consisting of Gd and Tb, and x 1 , y 1 , and z 1 satisfy 0.003≤x 1 ≤0.03, 0≤y 1 ≤2.1, and 0≤z 1 ≤2.2, respectively, and,
where, in the formula (2), R 2 includes at least one selected from the group consisting of Gd and Tb, and x 2 , y 2 , and z 2 satisfy 0.003≤x 2 ≤0.03, 0≤y 2 ≤2.1 and 0≤z 2 ≤1.5, respectively.
2. The light source device according to claim 1 , wherein
y 1 satisfies 0.1≤y 1 ≤2.1 in the formula (1), and
y 2 satisfies 0.1≤y 2 ≤2.1 in the formula (2).
3. The light source device according to claim 1 , wherein
x 1 satisfies 0.003≤x 1 ≤0.024 in the formula (1), and
x 2 satisfies 0.003≤x 2 ≤0.024 in the formula (2).
4. The light source device according to claim 1 , wherein the matrix includes a zinc oxide crystal oriented along a c-axis.
5. The light source device according to claim 1 , wherein
a peak wavelength of the excitation light is 360 nm or more and 480 nm or less, and
a peak wavelength of fluorescent light emitted by the phosphor particles is 548 nm or more and 580 nm or less.
6. The light source device according to claim 1 , wherein a spot diameter of the excitation light on a surface of the phosphor layer, the excitation light entering the phosphor layer, is 10 μm or more and 10 mm or less.
7. A projector comprising the light source device according to claim 1 .
8. A vehicle comprising the light source device according to claim 1 .