The fluorescent light pen is one of the markers, and the color is usually not too bright. Many people like to use fluorescent gel pens to mark important points in files or textbooks because they can present eye-catching colors without affecting the readability of the content. The ink of fluorescent gel pens is semi-transparent, and it cannot be seen after photocopying.

Features of fluorescent gel pens

Many fluorescent gel pens have bright and fluorescent colors, and they will emit fluorescent colors under ultraviolet light. The most common color is yellow, and there are also other colors such as pink, blue, green, orange, and purple.

In addition, there is a dry fluorescent light pen that does not have a felt tip. Instead, it has a special opening to stick the fluorescent strip inside the pen on the document, just like a cassette. This kind of fluorescent light pen is not as easy to remove as traditional ones.

Principle of fluorescent gel pens

Fluorescent gel pens are markers that have emerged in recent years. They use relatively thick and light ink to cover key parts for marking. After marking, the text remains clear and visible. Fluorescent gel pens contain fluorescent agents, and when they encounter ultraviolet light (such as sunlight, fluorescent lamps, and mercury lamps), they will produce a fluorescent effect and emit white light, making the color look fluorescent and eye-catching. They are commonly used in offices and learning environments.

Water-based fluorescent ink pen has emerged in recent years for marking masks. It uses relatively thick and light ink to cover key parts for marking. After marking, the text that is covered remains clear and visible. The most important function is that documents marked with fluorescent gel pens cannot be detected during copying.

The key principle of ultraviolet fluorescent ink is that visible fluorescent complexes are added to the ink that are excited by ultraviolet light. The absorbed light energy causes atomic energy level transitions, and then releases additional energy. The anti-counterfeiting feature is that under ultraviolet light (200nm~400nm), it emits visible light in red, yellow, green, and blue (400nm~800nm). The ink is divided into colored and colorless types, and there are two types of long-wave (365nm) and short-wave (254nm) types. The fluorescent pigment is an organic complex, which is finely ground and has a high luminescence rate. Usually, it is colorless or light white. Only under ultraviolet light (200nm~400nm), it presents various colors of visible light (400nm~800nm). Depending on the wavelength of the excitation light source, it can be divided into short-wave ultraviolet-excited fluorescent pigments (excitation wavelength of 254nm) and long-wave ultraviolet-excited pigments (excitation wavelength of 365nm).

Fluorescent ink pen contains fluorescent agents that will produce a fluorescent effect and emit white light when they encounter ultraviolet light (such as sunlight, fluorescent lamps, and mercury lamps), making the color look fluorescent and eye-catching. Nowadays, there are also hidden colorless fluorescent gel pens that do not have any color after writing. The content can be displayed after being illuminated by the purple light at the back end of the pen.