Fluorescent ink compositions

• US 6,458,294 B2
• Filed: 05/16/2001
• Issued: 10/01/2002
• Est. Priority Date: 03/17/1994
• Status: Expired due to Fees

• Current Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Original Assignee: Hitachi Maxell Limited (Maxell, Ltd.)
• Inventors: Yamada, Yukinori, Kamoto, Takanori, Saibara, Shoji, Oshima, Toshio, Nabeshima, Tomio
• Primary Examiner(s): Koslow, C. Melissa
• Application Number:
  US09/855,650
• Publication Number:
  US 20010035521A1
• Time in Patent Office: 503 Days
• Field of Search: 106/31.15, 106/31.32, 106/31.64, 252/301.35, 252/301.36, 252/301.34
• US Class Current: 252/301.36
• CPC Class Codes: C09D 11/50 Sympathetic, colour changing or similar inks
• CPC Class Codes: C09K 11/02 Use of particular materials as binders, particle coatings or suspension media therefor
• CPC Class Codes: C09K 11/06 containing organic luminescent materials
• CPC Class Codes: C09K 11/08 containing inorganic luminescent materials
• CPC Class Codes: C09K 11/7701 Chalogenides
• CPC Class Codes: C09K 11/7706 Aluminates
• CPC Class Codes: C09K 11/7708 Vanadates; Chromates; Molybdates; Tungstates
• CPC Class Codes: C09K 11/7709 Phosphates
• CPC Class Codes: C09K 11/7756 containing neodynium
• CPC Class Codes: C09K 11/7769 Oxides C09K11/7768 takes precedence
• CPC Class Codes: C09K 11/7774 Aluminates
• CPC Class Codes: C09K 11/7776 Vanadates; Chromates; Molybdates; Tungstates
• CPC Class Codes: C09K 11/7777 Phosphates

Abstract

A fluorescent substance of the following general formula:

Ln_XA_1-XPO₄

wherein Ln represents at least one element selected from the group consisting of Nd, Yb and Er; A represents at least one element selected from the group consisting of Y, La, Gd, Bi, Ce, Lu, In and Tb; and X represents a value within the range of 0.01 to 0.99.

Claims

1. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is comprised of an organic metallic compound comprising as an optically active element, at least Nd.

11. The fluorescent composition as defined in claim 1 or 6, characterized in that an organic material contained in the organic metallic compound is at least one element selected from the group consisting of carboxylic acid, ketone, ether and amine.

2. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, a binder transparent to both of the exciting light and the fluorescent light, and solvent, wherein the fluorescent substance is comprised of an organic metallic compound which is at least one organic material selected from the group consisting of neodymium cinnamate, complex salt of cinnamic acid with neodymium and ytterbium, complex salt of benzoic acid with neodymium and ytterbium, neodymium naphthoate, and complex salt of naphthoic acid with neodymium and ytterbium.

3. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance contains Nd and Yb, the molar ratio of Nd relative to Yb (Nd:

Yb) being within the range of 9;

1 to 5;

5.

4. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is of a kind having a rise time, required for the intensity of the fluorescent light to attain 90% of the maximum intensity thereof subsequent to start of irradiation of the exciting light, which is within 200 μ

sec.

12. The fluorescent composition as defined in claim 4 or 7, characterized in that the fluorescent substance is of a kind having a fall time required for the intensity of the fluorescent light to attenuate 80% of the maximum intensity thereof subsequent to interruption of the irradiation, which is within 200 μ

sec.

5. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the fluorescent light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is of a kind having a fall time required for the intensity of the fluorescent light to attenuate 80% of the maximum intensity thereof subsequent to interruption of the irradiation, which is within 200 μ

sec.

6. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is comprised of an organic metallic compound comprising as an optically active element, at least Nd.

7. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is comprised of an organic metallic compound which is at least one organic material selected from the group consisting of neodymium cinnamate, complex salt of cinnamic acid with neodymium and ytterbium, complex salt of benzoic acid with neodymium and ytterbium, neodymium naphthoate, and complex salt of naphthoic acid with neodymium and ytterbium.

8. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller that the wavelength of the maximum intensity of the exciting light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance contains Nd and Yb, the molar ratio of Nd relative to Yb (Nd:

Yb) being within the range of 9;

1 to 5;

5.

9. A fluorescent composition comprising a fluorescent substance in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is of a kind having a rise time, required for the intensity of the fluorescent light to attain 90% of the maximum intensity thereof subsequent to start of irradiation of the exciting light, which is within 200 μ

sec.

10. A fluorescent composition comprising a fluorescent compound in the form of ultra-microparticles capable of emitting a fluorescent light of a wavelength different from that of an exciting light and having an average particle size smaller than the wavelength of the maximum intensity of the exciting light, a binder transparent to both of the exciting light and the fluorescent light, and a solvent, wherein the fluorescent substance is of a kind having a fall time required for the intensity of the fluorescent light to attenuate 80% of the maximum intensity thereof subsequent to interruption of the irradiation, which is within 200 μ

sec.