Fluorescent material for the accumulation of light from LED lamps. Free Technical Library News

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Fluorescent material for accumulation of light from LED lamps

26.02.2017

A fairly massive transition from fluorescent lamps to LED sources of radiation has revealed one interesting problem. Traditional fluorescent paints and materials with the property of accumulating light and glowing after that in the dark are not well combined with LED lighting. Luminescent materials widely used on the market usually store energy when exposed to ultraviolet radiation, which is not found in the spectrum of LED lamps. Meanwhile, the demand for luminescent materials is high in many areas. For example, with the help of "luminous" paints, evacuation routes from high-rise buildings are indicated, which is critical in case of accidents.

To solve the problem and create materials with an afterglow effect in combination with LED lighting, the National Institute of Japan AIST and Tateyama Kagaku Industry undertook. The partners managed to create a material with the desired properties and a technology for applying it to a plastic (PET) substrate. This is an organometallic mixture, the composition of which is kept secret. Some rare earth material is used as the metal.

The obtained samples in combination with LED illumination (wavelength 460 nm) in the first 10 minutes are characterized by a luminescence at the level of 602 mcd/m2, which is three times more intense than in the case of commercially available luminescent materials. After four hours, the luminosity of the new material drops to 10 mcd/m2. Note that conventional materials reduce the intensity of the glow to this level already two hours after the cessation of illumination.

In the future, the developers intend to obtain a material with better properties. This can be achieved by choosing the type of activating rare earth additive and its amount. We add that the material is applied to the plastic substrate by the photoreaction method, and not in the form of mixtures with a hardener, as it is now. This provides high resistance to external adverse weather factors, including moisture ingress and high heat.

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The cameras non-contactly record several basic indicators: pulse, blink rate and speed, the position of the eyebrows and mouth, and the temperature of the human body. After analyzing the results, the system determines the strength (from mild boredom to extreme excitement) and the modality of emotions experienced by a person. The latter indicator covers the full range of "feelings" - from complete dissatisfaction with oneself to extreme complacency, and all states in between: fear, anxiety, discontent, irritation, anger, deep unhappiness, discomfort, sadness, depression, boredom, drowsiness, fatigue, relaxation, peace and lightness, contentment, happiness, joy, delight, euphoria, etc.

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