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Photoluminescent and JALITE Terminology

Photoluminescent and JALITE Terminology

Activator ionic impurity in a host material which acts as a luminescing centre, also called dopant. Afterglow general emission of light after a source of excitation energy is removed, usually by phosphorescence. Anti-Stokes a material which converts low energy light to high energy light by photoluminescence. Also called up-converter. Candela unit of luminous intensity. Cascading multiple absorption/emission cycles in a material where the emission from one cycle is matched to the absorption of the next. Cathodoluminescence luminescence where the initial energy comes from fast moving electron bombardment, such as on a television screen or computer monitor. Charging excitation of a phosphorescent material, usually by incident light. Chemiluminescence luminescence where the initial energy comes from chemical reactions, such as phosphorous burning in oxygen. Correlated colour temperature the colour of white light sources, the temperature of the black body radiator which produces the chromaticity most similar to the light source. Unit: °K. Daylight fluorescence (DF) fluorescence where the emission is in the visible spectrum. DIN67510 Part 1 specification describing afterglow performance in a standard way, in the form a/b - c - d - e, where a is afterglow brightness in mcd/m2 after ten minutes, b is afterglow brightness after sixty minutes, c is the decay period in minutes to 0.3 mcd/m2, d is excitation colour code, e is emission colour code. Parts 2 and 3 refer to in situ testing of photoluminescent items. Dopant ionic activator commonly used in inorganic phosphors. Excited state condition of a charged phosphor before emission. Electroluminescence (EL) luminescence where the initial energy comes from electric fields, usually alternating. Fluor a substance exhibiting fluorescence. Fluorescence very fast absorption and emission of photons where there is no appreciable afterglow. No electron spin inversion is involved. Flux (light) luminous intensity, usually of a light source, per unit solid angle; Unit: lumen. Illuminant A, B, C incandescent illumination in the range 380nm to 770nm, respectively 2856K (yellow), 4874K (mean noon sunlight) and 6774K (average daylight, blue). Illuminant D daylight illuminants defined from 300-830nm, designated with a two digit subscript to describe Correlated Colour Temperature, e.g. D65 indicates 6500K, close to Illuminant C. Illumination luminous flux, usually of incident light. Units: lux or lumens per square metre. Infrared part of the electromagnet spectrum immediately less energetic than visible light, ranging from around 700 nanometres to 10 microns wavelength. Intersystem crossing transfer from one molecular angular momentum state to another by electron spin inversion. Principal of physical phosphorescence. Killing quenching. Light output quantum efficiency multiplied by amount of absorbed radiation. Lumen unit of light flux. One lumen equals the flux emitted into a solid angle of one steradian by a point source of one candela. Luminance brightness, usually of a surface, i.e. luminous intensity per unit area. unit: candelas per square metre, usually expressed in millicandelas per square metre. Luminescence emission of light from a substance unaccompanied by heat. Luminophor luminescent material. Luminous directional reflectance reflectance of a surface in given directions of illumination and view. The ratio of the brightness of a surface to the brightness that an ideally diffusing, perfectly white surface would have if illuminated in the same way. Units: none. Luminous intensity a fundamental unit derived from black body radiation at set conditions in a given direction. Unit: candela. Luminous efficiency (L) luminous flux emitted by a source, per unit of power consumed. Unit: lumens per Watt. Lux unit of illuminance, lumens per square metre. In imperial units, one footcandle is approximately 10 lux. Optically active a) luminescent, b) able to change the polarity of incident light during reflection. Phosphor a substance exhibiting the property of phosphorescence. Phosphorescence slower absorption and emission of photons where afterglow is usually apparent, involving electron spin inversion allowing absorbed energy to be trapped for a period before being released as photons. Photoluminescence luminescence where the energy comes from incident light. Includes fluorescent and phosphorescent processes. Quantum yield (q) ratio of energy emitted by a luminescent substance to that absorbed, expressed as a percentage or decimal part of unity. Units: none. Quenching the loss of luminescent emissions to absorbing centres, or the addition of an agent to do this. Also called killing. Radiant efficiency ratio of emitted luminescent power to power absorbed from exciting radiation. Radioluminescence (RL) luminescence where the initial energy comes from radioactive decay, e.g. as with tritium. Products relying on RL are also called self emitters. Resonance radiation fast fluorescence with no internal loss of energy. Saturation charging of a phosphorescent material to maximum. Scintillator photoluminescent material with absorption at very low wavelengths, i.e. gamma or X rays. Self emitter radioluminescent material. Stokes shift difference in wavelength peaks between absorption and emission curves in photoluminescent materials, positive where wavelength increases, negative where wavelength decreases. Unit: nanometres. Strontium Aluminate a collective term for a group of crystalline phosphors derived from Strontium Oxide and Alumina (and silica) singally or doubly doped with rare earths Europium and Dysprosium. Thermoluminescence luminescence where heat energy triggers emission of photons from internal energy previously stored. Triboluminescence short lived luminescence caused by the violent breaking of chemical bonds, often associated with frictional forces. Ultraviolet part of the electromagnet spectrum immediately more energetic than visible light, ranging from approx. 100 nanometres (VUV) to 400 nanometres (UVA) wavelength. Up-conversion photoluminescent process converting lower energy incident light to higher energy emitted light. Also called anti-Stokes.

General information

Escape route lighting

Escape route lighting

ISO 15370 was the first International Standard for escape route lighting and is commonly known as LLL - Low Location Lighting. ISO 16069 Safety Wayguidance Systems (SWG) followed later for the built environment and laying down principles for design. This Standard was used by New York City as the basis for technical recommendations for stairwell egress systems now required by law for tall buildings.

Products , Technical , Workplace Safety

Safety Signs and Symbols

Safety Signs and Symbols

Safety Signs and Symbols Since the early 1970's, National and International Standards bodies have been working to provide best practice in the design of graphical symbol safety signs. The ultimate goal is to communicate effectively with safety signs and symbols that are independent of language. With base work being done in the 1990's on the process of standardization and coordination of efforts from all over the world, the keystone International Standard ISO 7010 was born. ISO 7010 -2011 has now completed a further revision to cover the vast majority of safety signs and symbols common to the workplace. Many more are in the process of standardisation covering more specialised fields and to provide essential accreditation to the best practice available for all the presently standardised safety signs from many other ISO sources and the world. JALITE has participated in this process now for more than 20 years and offers the ultimate service of design and conformance to best practice standards. It is expected that ISO 7010 will be adopted as the National Standard by many countries and has now become the European Standard as ISO EN 7010.

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Photoluminescent Self Adhesive Tape

Photoluminescent Self Adhesive Tape

Jalite AAA photoluminescent tapes are like no other, engineered with the highest initial luminance in its class, it gives occupants the most light when they need it - during the first minutes of a power outage. Jalite AAA tapes luminance also last an extraordinarily long time, even with a minimal charge or exposure to the background lighting! Jalite photoluminescent tapes have been provided with an exceptionally versatile and strong adhesive for good service on walls and handrails and various surfaces. JALITE Phtoluminescent Tapes were the first tapes full accredited for LLL according to ISO 15370 and approved by the Japanese Ministry of Transport. They were also the first tapes approved by the New York Building Divisions Material and Equipment Acceptance for stairwell egress systems. Unlike many materials used in New York City, JALITE tapes were shown to perform extremely well in all installed locations as required around obstacles and on handrails.

General information

Technical Service

Technical Service

JALITE Technical Service is here for one thing only and that is to solve problems. We grease wheels and get things moving and no project is too small or too big. Give us a call our technical skills can be assisting you in no time if you have a risk to be reduced or a product idea in mind.

General information

Safety Wayguidance Systems

Safety Wayguidance Systems

Safety Way Guidance Systems are defined in ISO 16069 as system to provide conspicuous and unambiguous information and sufficient visual cues to enable people to evacuate an occupied area in an emergency along a specified escape route by using a comprehensive arrangement of visual components, signs and markings. Non-electrical safety way guidance systems use JALITE photoluminescent components and offer a safe guard against normal power loss and the possible failure of electrical emergency lighting. ISO 16069 gives the comprehensive group of way guidance Exit signs to be used to lead people effectively along an escape route to the final Exit and to the assembly point.  

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JALITE products are found from professionals in the fields of property management and maintenance, fire protection and fire prevention service companies, safety product supply companies and other specialist sign companies.

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Jalite is active in over 109 countries

In the 35 year history of JALITE, products have been developed and supplied to over 100 countries in the world and often with safety messages in the local language or with dual language, with the International Safety language English. It has been a JALITE tradition to fully comply with National and International Standards for the design of our products. Now, with JALITE presence on three continents and Authorised Distribtors world wide we can be considered local throughout the world.

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  • Lloyd's Register
  • BSI Group
  • International Maritime Organization
  • International Organization for Standardization
  • Photoluminescent Safety Products Association