| PHOTOLUMINESCENT FILMS FOR LED DISPLAY LIGHTING SYSTEMS WITH BIOLOGICALLY ADEQUATE RADIATION SPECTRUM Lyudmila Bikova1; Nina Zhelyabovskaya1; Valentina Lichmanova1; Polina Merkulova1; Vladimir Ulasyuk2; 1ELTAN CORP, Fryazino, Russian Federation; 2SRC BIOLUMEN, Fryazino, Russian Federation; PAPER: 287/AdvancedMaterials/Regular (Oral) SCHEDULED: 11:55/Wed. 30 Nov. 2022/Saitong ABSTRACT: A number of studies have shown that modern LED light sources have a noticeable negative effect on human health, affecting the retina of the eye. The harm is caused by short-wave blue and violet light, which in the spectrum of such light sources has in some cases an intensity increased up to 30% compared to ordinary incandescent lamps. For example, in [1] summarized data on the sensitivity to the spectral distribution of light perceived by the eye, showing the dependences of acute UV-blue phototoxicity, spectral sensitivity of melanopsin with a maximum at 479-483 nm, and sensitivity to suppression of the generation of melatonin with a maximum at 459-464 nm, more dependent on blue light than visual functions mediated by rods (rhodopsin). In order to overcome this drawback of LED light sources, including those used in display backlight systems, the authors of [2] first proposed and developed the concept of LED light sources with a biologically adequate radiation spectrum (BALEDS) [3]. For the production of BALEDS, a technology has been developed for the production of composite photoluminescent films (PLP) from a suspension of a two-component silicone compound OE 6636 (Dow Corning) and photoluminophores based on aluminum-gallium garnets of rare-earth elements activated by cerium with a composition described by the stoichiometric formula Y3-y-zLuyCezAl5-xGaxO12, where 1.8 <x <2.1, 0≤y≤2.86, 0.12≤z≤0.15. PLP are made by applying a suspension to a polyester film using an automatic applicator, followed by annealing in air for 1 hour at a temperature of 100 °C. The PLP containing the photoluminophore (Y2.79Ce0.12Lu0.09Al3.1Ga1.9O12) and excited by an LED with a maximum radiation at a wavelength of 480 nm is used for LED backlight of the augmented reality area of a LCD for projection on a windshield [4]. This work was carried out with the partial support of the RFBR grant (project No. 20-07-01063_a). References: 1. M.A. Mainster. Violet and blue light blocking intraocular lenses: photoprotection versus photoreception. British Journal of Ophthalmology, 90, pp. 784-792 (2006). 2. V. Ulasyuk, N. Soschin. Biologically adequate white LED lamps based on rare earth phosphors 4th International Workshop on PHOTOLUMINESCENCE IN RARE EARTHS: PHOTONIC MATERIALS AND DEVICES (PRE'12). Kyoto, Japan, 28-30 March 2012. 3. Ulasyuk V.N. LED white light source with biologically adequate emission spectrum. Patent RU2693632. Published: 03.07.2019 Bul. No. 19. 4. Ulasyuk V.N. Car head-up display. Patent RU2732340. Published: 09/15/2020 Bul. No. 26. |
