Effect of chlorine concentration on the spectral characteristics of electroluminescence in ZnS: Cu: Cl phosphor

Pillai, Sandhya; Vallabhan, C. P. G.

doi:10.1016/0038-1098(83)90119-9

Cited by 9 publications

(2 citation statements)

References 5 publications

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“…The Cl − can form a donor level just below the conduction band, the density of which increases with the doping concentration of Dy 3+ ions since dysprosium is introduced in the form of DyCl 3 . In ZnS this level was found at 0.46 eV below the conduction band [13,14]. EPR spectrum confirms the existence of F + center.…”

Section: Photoluminescence Excitation Spectrasupporting

confidence: 59%

Effect of dysprosium doping on the optical properties of SrS:Dy,Cl phosphor

Anila

Jayaraj

2010

Journal of Alloys and Compounds

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Section: Photoluminescence Excitation Spectrasupporting

confidence: 59%

Effect of dysprosium doping on the optical properties of SrS:Dy,Cl phosphor

Anila

Jayaraj

2010

Journal of Alloys and Compounds

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“…Some researchers experimentally investigated the blue enhancement at higher electrical frequencies. 37,38 A tentative explanation of this behaviour is proposed based on the presence of two different phases of the EL materials, resulting in two emission sites. 38 This explanation also must consider the emission mechanism described in ref.…”

Section: Electrical Characteristics Of the Acel Samplesmentioning

confidence: 99%

Bright, wind-driven white mechanoluminescence from zinc sulphide microparticles embedded in a polydimethylsiloxane elastomer

Jeong

Song

Joo

et al. 2014

Energy Environ. Sci.

298

189

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A variety of mechanoluminescent (ML) materials have recently reinvigorated studies of luminescence activated by mechanical stress, but few practical applications have been demonstrated due to the destructive nature of the process. To overcome these shortcomings, elastico-mechanoluminescent (elastico-ML) materials, which generate luminescence under elastic deformation, have been suggested with a view to their use in practical devices. However, the weak brightness and limited white colour expression of these materials must be resolved before they can be employed in practical applications. Here, we report a wind-driven ML device that produces significant brightness and emits warm/neutral/cool white light over a range of colour temperatures from zinc sulphide (ZnS) microscopic particles embedded in a polydimethylsiloxane (PDMS) composite. Harnessing wind-activated mechanoluminescent devices in practical displays or lighting systems could pave the way to new environmentally friendly lights, which reduce energy waste and promote sustainability. Broader context Mechanically driven light generation is an exciting and under-exploited phenomenon with a variety of possible practical applications. Mechanoluminescence (ML) has potential applications in colourful displays and white-light sources driven by vibrating mechanical actions. However, the related research has suffered from the difficulty in obtaining a strong, repeatable signal, so enhancing ML intensity has not been a major area of focus. Weak brightness and limited white colour expression of ML must be resolved with a view to its use in practical ML displays or ML light sources. Here we report a new wind-driven ML device that produces signicant brightness and emits light over a range of tunable white colours. A patterned, colourful ML driven by wind was also demonstrated. Harnessing wind-driven ML in practical lighting systems could pave the way to new environmentally friendly lights based on wind motion, to cut down energy waste and promote sustainability.

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A study on the electroluminescence spectrum of CaS:Sm and CaS:Dy

Pillai

Vallabhan

1986

Physica Status Solidi (b)

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A method of preparation of calcium sulphide phosphors doped with samarium and dysprosium is given. The electroluminescence (EL) spectra of these two phosphors in the visible region are recorded. The EL spectrum of CaS:Sm has three groups of emission bands which are well resolved into discrete lines. On the basis of crystal field parameter calculations using the measured line separation, the site of the samarium impurity in CaS is identified. CaS : Dy gives five emission bands which are further resolved into lines. The band with maximum intensity occurring a t 580 nm is found to be resolved into six lines. The splitting pattern is explained again on the basis of crystal field parameter calculations.

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Effect of chlorine concentration on the spectral characteristics of electroluminescence in ZnS: Cu: Cl phosphor

Cited by 9 publications

References 5 publications

Effect of dysprosium doping on the optical properties of SrS:Dy,Cl phosphor

Effect of dysprosium doping on the optical properties of SrS:Dy,Cl phosphor

Bright, wind-driven white mechanoluminescence from zinc sulphide microparticles embedded in a polydimethylsiloxane elastomer

A study on the electroluminescence spectrum of CaS:Sm and CaS:Dy

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