Microwave Synthesis of a Long-Lasting Phosphor

Filhol, Jean‐Sébastien; Zitoun, David; Bernaud, Laurent; Manteghetti, Alain

doi:10.1021/ed086p72

Cited by 27 publications

(10 citation statements)

References 6 publications

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“…Then five laboratory sessions (3 h each, weeks 5–9) follow, including the syntheses of ferrofluids, superconductors, phosphorescent materials, rubies, and opals. Parts of the protocol materials have been published in the Journal of Chemical Education . − Table contains a brief description of the synthesis of each of the materials (see the Supporting Information also). These laboratory sessions were chosen to illustrate key concepts, to see things for real, to search for the relevant synthesis protocol in the literature, to introduce new equipment or methodologies to the students, to train them in specific practical skills, to manage safety issues, to teach experimental design, and, finally, to develop collaborative, logical reasoning and interpretative skills …”

Section: Chemistry: Magical Sciencementioning

confidence: 99%

Integrating Lecture and Laboratory Work for a Materials Chemistry Course to Engage and Motivate Students through Highly Visual and Intriguing Syntheses

2020

Self Cite

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An original integrated course called “Chemistry: Magical Science” at Montpellier University (France) is presented. This approach mixes tutorials and practical work by using the pretext of high-tech materials synthesis to teach students knowledge, skills, and practical techniques. It also educates students about chemical risks and bibliographic research and trains them for oral presentations. The practical work is partly directed and partly autonomous. This work involves a description of this course and its evaluation.

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Section: Chemistry: Magical Sciencementioning

confidence: 99%

Integrating Lecture and Laboratory Work for a Materials Chemistry Course to Engage and Motivate Students through Highly Visual and Intriguing Syntheses

2020

Self Cite

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“…Vorarbeiten im Rahmen einerm ikrowellengeeignetenS yntheses ind für denr oten LeuchtstoffY 2 O 3 :Eu 3 + [9]l iteraturbekannt, deri n LEDs aber nichte ingesetztw erdenk ann. WeitereS ynthesen andererL uminophore finden sich in deri nternationalen, che-miedidaktischenL iteratur [10][11][12].N euereo rganische Leuchtdioden (OLEDs)wurdenaberbereits intensiv thematisiert [ 13,14].A uchd ie alltagsnaheM ikrowellef indetb ereits Anwendungi mC hemieunterricht [ 15,16].D urch dieW ahl einfacher, kostengünstigeru nd in Schulenz ugelassener Geräte undC hemikalien iste ineD urchführungd er Synthese einesL euchtstoffes im Chemieunterricht derS ekundarstufe I undIImçglich. Died arausr esultierendenS ubstitutionsdefekted er inkorpo-riertenMetallionen im Gitterführen zurFähigkeit, durchpho-tochemischeAnregungLicht zu emittieren [18].Fürdiese Dotierunge ignens ichi nsbesondereS eltenerd-Ionen.I mF alle derD otierung vonY AG mitC e 3 + -Ionen verfügt Ceri mV ergleich zu Yttrium überein zusätzliches Va lenzelektron (inder Grafik gründ argestellt)u nd eineng rçßerenI onenradius.…”

Section: "What'swiththe Lightbulb?"unclassified

Blue turns white – Chemistry's Contribution to Sustainable Lighting Using the Example of a LED‐Phosphor

Diekemper

Schnick

Schwarzer

2020

Chemkon

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Zusammenfassung: DieC hemiel eistet einenw esentlichen Beitragz ue iner nachhaltigen,e nergiesparenden Beleuchtungdurch dieEntwicklung energieeffizienter undanwenderfreundlicherLeuchtstoffeinLEDs(Light Emitting Diodes). So wärenohnedie EntwicklungmodernerLeuchtstoffeweißesund warmweißes Lichtdurch LED-Leuchtmittel in unseremA lltagnicht mçglich. Im Rahmen desh ierv orgestellten Experimentsw irdd er wichtige LED-LeuchtstoffY ttrium-Aluminium-Granatd otiert mitC er (Y 3 Al 5 O 12 :Ce 3 + ,Y AG :Ce 3 + )h ergestellt.Die schülergerechteund schulgeeignete Synthese erfolgtinunter einerMinuteineiner Haushaltsmikrowelle. Anschließend kçnnen dief arbkonvertierenden Eigenschaftend urch Auftragend es selbst hergestellten Leuchtstoffesauf eine blaueLED direkt nachvollzogenwerden.

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“…When aiming to introduce systems thinking, an important requirement for a successful learning experience is school students’ interest and the relevance of the topic to their everyday life. Luminophores could be a good opportunity to show the relevance of chemistry to everyday life, as already shown in educational activities related to phosphors and lighting. − An example would be to have students analyze a smartphone because every current device has an LED flash for photography, which often contains YAG:Ce. This can be easily demonstrated under UV excitation by observing the fluorescence of this material.…”

Section: Luminophores For Integrating Systems Thinking Into Modern Sc...mentioning

confidence: 99%

Microwave Synthesis of a Prominent LED Phosphor for School Students: Chemistry’s Contribution to Sustainable Lighting

2019

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Scarcer raw materials and climate change are scientific facts that make it necessary to enhance energy efficiency and to recycle raw material. Fundamental researchers at universities as well as in industry agree that light-emitting diodes (LEDs) are the most efficient and sustainable light sources of the future. Chemistry plays a significant role in the development of white, energy-efficient LEDs; however, students and society do not seem aware of this role. This paper presents a school-student-friendly synthesis of cerium-doped yttrium aluminum garnet (YAG:Ce) in a laboratory microwave oven. YAG:Ce is the most widely applied luminescent material ("phosphor") used in white LEDs. The initial blue light of a gallium nitride-based primary LED is partly down-converted by the YAG:Ce phosphor on top of the LED chip, resulting in yellow-green emission. Additive color mixing (blue + yellow-green) results in cold-white light generation. This experiment aims to demonstrate chemistry's contribution to sustainable development in a comprehensible way. On the basis of such phosphorconverted LEDs, the interdependence of and cooperation between different scientific disciplines are outlined. The critical question of the related raw materials, in this case especially rare earth elements (REEs), their lifetime, and their possible recycling, represents another important issue for sustainable development and systems thinking and is shown in this example from everyday life.

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Microwave Synthesis of a Long-Lasting Phosphor

Cited by 27 publications

References 6 publications

Integrating Lecture and Laboratory Work for a Materials Chemistry Course to Engage and Motivate Students through Highly Visual and Intriguing Syntheses

Integrating Lecture and Laboratory Work for a Materials Chemistry Course to Engage and Motivate Students through Highly Visual and Intriguing Syntheses

Blue turns white – Chemistry's Contribution to Sustainable Lighting Using the Example of a LED‐Phosphor

Microwave Synthesis of a Prominent LED Phosphor for School Students: Chemistry’s Contribution to Sustainable Lighting

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