Erasable tattoo ink and method for removing tattoos

An erasable tattoo ink comprising:

• a suspension including a preselected visible color pigment;
• at least one supramolecular upconverting nanoparticle structure surface treated with a ligand coating, whereby the nanoparticle structure is uniformly soluble and stably miscible in the suspension, the nanoparticle structure including:
• at least one upconverting nanoparticle energy donor adapted to release energy having a first preselected wavelength in response to exposure to energy having a wavelength falling in the near infrared or infrared spectrum;
• at least one photo-initiating, energy absorbing acceptor moiety located at a preselected intramolecular distance d from the at least one energy donor, the photo-initiating moiety being adapted to receive the energy released by the at least one energy donor, the acceptor moiety being selected from the group consisting of azobisisobutyronitrile (AIBN), benzoyl peroxide, camphorquinone, trimethylbenzoyl-diphenylphosphine oxide, phenyl propanedione, ethyl dimethylamino benzoate, dihydroxyethyl-para-toluidine, or dimethylaminoethyl methacrylate;
• a molecule adapted to link the at least one energy donor to the at least one acceptor moiety, the linking molecule being structured and arranged to establish and maintain the preselected intramolecular distance between the at least one energy donor and the at least one acceptor moiety;
• and
• a terminated moiety structured and arranged to bind the linking molecule to the energy donor and to control the relative orientation of the energy donor with respect to the acceptor moiety;
• whereby the relative orientation of the energy donor with respect to the acceptor moiety and the preselected intramolecular distance d cooperate with one another to optimize the resonantly-coupled, non-radiative energy transfer from the energy donor to the acceptor moiety;
• and;
• wherein the at least one acceptor moiety is structured and arranged to release energy having a second preselected wavelength in response to the resonant transfer of energy from the donor to the acceptor moiety, the released energy be adapted to photo bleach or degrade the visible color pigment of the ink.

An erasable tattoo ink comprising:

• a suspension including a preselected visible color pigment;
• at least one upconverting particle structure surface treated with a ligand coating,
• whereby the particle structure is uniformly soluble and/or stably miscible in the ink suspension, the particle structure including:
• at least one upconverting particle energy donor adapted to release energy having a first preselected wavelength in response to exposure to energy having a wavelength falling in the near infrared or infrared spectrum;
• at least one photo-initiating, energy absorbing acceptor moiety located at a preselected intramolecular distance d from the at least one energy donor, the photo-initiating/ . . . moiety being adapted to receive the energy released by the at least one energy donor;
• a molecule adapted to link the at least one energy donor to the at least one acceptor moiety, the linking molecule being structured and arranged to establish and maintain the preselected intramolecular distance between the at least one energy donor and the at least one acceptor moiety;
• and
• a terminated moiety structured and arranged to bind the linking molecule to the energy donor and to control the relative orientation of the energy donor with respect to the acceptor moiety, the terminated moiety being selected from the group of terminated moieties consisting of amine-terminated, hydroxyl-terminated, phosphoric-terminated, aldehyde-terminated, pyridine-terminated, and carboxylic acid-terminated moieties;
• whereby the relative orientation of the energy donor with respect to the acceptor moiety and the preselected intramolecular distance d cooperate with one another to optimize the resonantly-coupled, non-radiative energy transfer from the energy donor to the acceptor moiety;
• and;
• wherein the at least one acceptor moiety is structured and arranged to release energy having a second preselected wavelength in response to the resonant transfer of energy from the donor to the acceptor moiety, the released energy be adapted to photo bleach or degrade the visible color pigment of the ink.