Thermoluminescent phosphor and method of producing the same

A method of producing a thermoluminescent phosphor comprising lithium heptaborate as a base material and copper as a luminescent center present in the base material, the method comprising:

• a first step for mixing lithium tetraborate, boron oxide, and copper(II) oxide together to form a mixture,
• a second step for subjecting the mixture to thermal treatment to change the mixture into the thermoluminescent phosphor comprising lithium heptaborate as a base material and copper as a luminescent center present in the base material,
• wherein the lithium tetraborate and the boron oxide are mixed in the molar ratio of 3:1 in the first step.

A method of producing a thermoluminescent phosphor comprising lithium heptaborate as a base material and copper as a luminescent center present in the base material, the method comprising:

• a first step for mixing lithium tetraborate, boron oxide, and copper(II) oxide together to form a mixture,
• a second step for subjecting the mixture to thermal treatment to change the mixture into the thermoluminescent phosphor comprising lithium heptaborate as a base material and copper as a luminescent center present in the base material,
• wherein the lithium tetraborate and the boron oxide are mixed in the molar ratio of 6:1 in the first step.

A method of producing a thermoluminescent phosphor comprising lithium heptaborate as a base material and copper as a luminescent center present in the base material, the method comprising:

• a first step for mixing lithium tetraborate, boron oxide, and copper(II) oxide together to form a mixture,
• a second step for subjecting the mixture to thermal treatment to change the mixture into the thermoluminescent phosphor comprising lithium heptaborate as a base material and copper as a luminescent center present in the base material,
• wherein the lithium tetraborate and the boron oxide are mixed in the molar ratio of 2:1 in the first step.