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A phosphor layer is composed of tri-band phosphor particles bound together by a binder. A material as the main component of the binder is a mixture of (1) a compound formed by calcium oxide, barium oxide, and boron oxide, and (2) calcium pyrophosphate. Dissolved in the main component material of the

A phosphor layer is composed of tri-band phosphor particles bound together by a binder. A material as the main component of the binder is a mixture of (1) a compound formed by calcium oxide, barium oxide, and boron oxide, and (2) calcium pyrophosphate. Dissolved in the main component material of the binder is a luminescent component that converts ultraviolet radiation of 254 nm to ultraviolet radiation of longer wavelengths or to visible light. Examples of such a luminescent component include an oxide of gadolinium (Gd), terbium (Tb), europium (Eu), neodymium (Nd), or dysprosium (Dy), each of which belongs to lanthanum series, and an oxide of thallium (Tl), tin (Sn), lead (Pb), or bismuth (Bi).

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1. A lamp comprising a phosphor layer formed of phosphor particles bound together by a binder, the binder being manufactured from a binder composition comprising a luminescent component, the luminescent component containing two different rare-earth oxides, one being selected from the first group con

1. A lamp comprising a phosphor layer formed of phosphor particles bound together by a binder, the binder being manufactured from a binder composition comprising a luminescent component, the luminescent component containing two different rare-earth oxides, one being selected from the first group consisting of gadolinium oxide and praseodymium oxide, and the other being selected from the second group consisting of dysprosium oxide and neodymium oxide.2. The lamp according to claim 1, further comprising a discharge tube composed of a glass tube, the glass tube being filled with mercury and a rare-gas and having the phosphor layer formed on an inner surface thereof, whereina rare-earth oxide contained in the binder emits ultraviolet radiation and visible light upon exposure to ultraviolet radiation from the mercury in an excited state, a wavelength of the ultraviolet radiation from the binder being longer than a wavelength of the ultraviolet radiation from the mercury. 3. The lamp according to claim 2, whereinan overall luminous flux emitted from the lamp includes: a first luminous flux formed of visible light emitted from the phosphor particles upon exposure to the ultraviolet radiation from the excited mercury; a second luminous flux formed of visible light emitted by the luminescent component in the binder upon exposure to the ultraviolet radiation from the excited mercury; and a third luminous flux formed of visible light emitted from the phosphor particles upon exposure to the ultraviolet radiation from the luminescent component, the luminescent component emits the ultraviolet radiation upon exposure to the ultraviolet radiation from the excited mercury, and a total of the second luminous flux and the third luminous flux constitutes 2% of the overall luminous flux. 4. The lamp according to claim 1, wherein a content of the binder composition in the phosphor layer is 0.001 to 10 wt % of the phosphor particles.5. A lamp comprising a phosphor layer formed of phosphor particles bound together by a binder, the binder being manufactured from a binder composition comprising, as a main component, one of (i) a mixture of calcium pyrophosphate and a compound formed by calcium oxide, barium oxide, and boron oxide, (ii) a compound formed by calcium oxide, barium oxide, and boron oxide, (iii) aluminum oxide, and (iv) a mixture of aluminum oxide and calcium pyrophosphate, the binder composition further comprising a luminescent component, the luminescent component containing at least one selected from the group consisting of gadolinium oxide, neodymium oxide, dysprosium oxide, thallium oxide, tin oxide, lead oxide, and bismuth oxide.6. A glass composition for a lamp, comprising:silicon dioxide as a main component; a luminescent component containing at least one rare-earth oxide selected from the group consisting of praseodymium oxide, neodymium oxide, europium oxide, gadolinium oxide, terbium oxide, and dysprosium oxide; at least one of aluminum oxide and diboron trioxide in an amount of at least 1 wt %; at least one of R2O and R′O in an amount of 15 wt % or less, where R is at least one selected from the group consisting of lithium, sodium, and potassium, and R′ is at least one selected from the group consisting of magnesium, calcium, strontium, barium, and zinc; and lead oxide in an amount of 1 to 40 wt %, wherein a content of the silicon dioxide is 55 to 85wt %, and a content of said at least one of the aluminum oxide and the diboron trioxide is 1 to 5 wt %. 7. The glass composition according to claim 6, wherein a thermal expansion coefficient of the glass composition is from 90×10?7K?1 to 100×10?7K?1.8. A lamp, comprising:a phosphor layer formed of phosphor particles bound together by a binder, the binder being manufactured from a binder composition comprising a luminescent component, the luminescent component containing two different rare-earth oxides, one being selected from the first group consisting of gadolinium oxide, terbium oxide, and praseodymium oxide, and the other being selected from the second group consisting of europium oxide, terbium oxide, dysprosium oxide, and neodymium oxide; and a discharge tube composed of a glass tube, the glass tube being filled with mercury and a rare-gas and having the phosphor layer formed on an inner surface thereof, wherein a rare-earth oxide contained in the binder emits ultraviolet radiation and visible light upon exposure to ultraviolet radiation from the mercury in an excited state, a wavelength of the ultraviolet radiation from the binder being longer than a wavelength of the ultraviolet radiation from the mercury. 9. The lamp according to claim 8, whereinan overall luminous flux emitted from the lamp includes: a first luminous flux formed of visible light emitted from the phosphor particles upon exposure to the ultraviolet radiation from the excited mercury; a second luminous flux formed of visible light emitted by the luminescent component in the binder upon exposure to the ultraviolet radiation from the excited mercury; and a third luminous flux formed of visible light emitted from the phosphor particles upon exposure to the ultraviolet radiation from the luminescent component, the luminescent component emits the ultraviolet radiation upon exposure to the ultraviolet radiation from the excited mercury, and a total of the second luminous flux and the third luminous flux constitutes 2% of the overall luminous flux. 10. A lamp, comprising:a phosphor layer formed of phosphor particles bound together by a binder, the binder being manufactured from a binder composition comprising a luminescent component, the luminescent component containing two different rare-earth oxides, one being selected from the first group consisting of gadolinium oxide, terbium oxide, and praseodymium oxide, and the other being selected from the second group consisting of europium oxide, terbium oxide, dysprosium oxide, and neodymium oxide, wherein a content of the binder composition in the phosphor layer is 0.001 to 10 wt % of the phosphor particles. 11. A lamp comprising a glass member manufactured from the glass composition according to claim 6.12. A glass composition for a lamp, comprising:silicon dioxide as a main component having a content of 75 to 98.7 wt %; a luminescent component containing at least one rare-earth oxide selected from the group consisting of praseodymium oxide, europium oxide, terbium oxide, and dysprosium oxide; aluminum oxide having a content of 0.1 to 3 wt %; diboron trioxide having a content of 0.1 to 3 wt %; and R2O in an amount of 0.1 to 3 wt %, where R is at least one selected from the group consisting of lithium, sodium, and potassium. 13. A lamp comprising a glass member manufactured from the glass composition according to claim 12.14. A binder composition for a phosphor layer in a lamp, comprising, as a main component, one of (i) a mixture of calcium pyrophosphate and a compound formed by calcium oxide, barium oxide, and boron oxide, (ii) a compound formed by calcium oxide, barium oxide, and boron oxide, (iii) aluminum oxide, and (iv) a mixture of aluminum oxide and calcium pyrophosphate, the binder composition further comprising a luminescent component, the luminescent component containing at least one selected from the group consisting of gadolinium oxide, neodymium oxide, dysprosium oxide, thallium oxide, tin oxide, lead oxide, and bismuth oxide, wherein the luminescent component contains at least one selected from the group consisting of thallium oxide, tin oxide, lead oxide, bismuth oxide, a content of the selected at least one rare-earth oxide being 0.01 to 1 wt %.