LED lighting safe for human eyesight

LED light is tiring on the eyes and can lead to severe visual disturbances. Researchers from the Warsaw University of Technology are working on a prototype of a modern white LED lamp with light that is safe for human eyesight.

Artificial lighting is one of the most characteristic determinants of modern civilization. Thanks to him it became possible, among others significant independence of human activity from the daily rhythm of sunlight. In recent years, white light sources based on LED technology have been particularly important, used, among others, by to illuminate small rooms and in all kinds of displays.

Natural versus artificial light

Light sources based on LED diodes have undeniable advantages: they are energy-saving, can be combined into modules, they are getting cheaper and their light, when it comes to visual impressions, resembles natural light. However, despite the apparent similarity of natural and artificial lighting based on white LEDs, the emission spectra of the latter differ, sometimes significantly, from that of natural daylight.

Prototype of a safe LED lamp

The aim of the project is to develop the above-mentioned idea, the culmination of which will be the preparation of a prototype of a modern LED lamp consisting of a commercially available ordinary LED near UV / violet and a glass / nanomaterial that acts as a phosphor produced as part of the project. As part of the project, glass matrices of various compositions will be synthesized, based on borate and phosphate compounds. The process of controlled reduction of rare earth ions will be refined in order to obtain the photoluminescence spectrum closest to that of visible light. A comprehensive characterization of the optical properties of the produced phosphors will be carried out.

The project team consists of: prof. dr hab. Marek Wasiucionek, project manager (Faculty of Physics, WUT), dr hab. Eng. Tomasz K. Pietrzak (Faculty of Physics, WUT), dr inż. Bartosz Fetliński (Institute of Microelectronics and Optoelectronics, Warsaw University of Technology), mgr inż. Agata Jarocka (Faculty of Physics, WUT).

The project "New glassy and nanocrystalline phosphors for white LED lighting safe for human eyesight" is funded under the research grant FOTECH-2.

The whole article is available in Polish at biuletyn.pw.edu.pl