Optical performance of a versatile illumination system for high divergence LED sources

Rodríguez-Vidal, E.; Otaduy, D.; Ortiz, Dolores; Villafañe, Fernando; Moreno, Fernando; Saiz, J. M.

doi:10.1016/j.ijleo.2013.09.064

Cited by 6 publications

(2 citation statements)

References 7 publications

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“…1. If the function of a parabolic reflector is reversed, the light emitting from the point will be reflected in parallel, and the beam will acquire the maximum luminous intensity at the center of the LED searchlight [5,6].…”

Section: Ray-tracingmentioning

confidence: 99%

Study on the Design of a High Condensing LED Searchlight

Kim¹,

Kim²,

Kim³

et al. 2015

Transactions on Electrical and Electronic Materials

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This paper dealt with the condensing technology of an LED light source that uses a parabolic reflector to replace a searchlight equipped with a xenon lamp. A ray-tracing simulation was conducted to analyze the influence of the diameter of the reflector and the size of the light source on light condensing. The combination of a parabolic reflector with a diameter of 620 mm and a focal distance of 220 mm, and a 9 mm multi-chip package (MCP) with a luminous flux of 7,000 lm showed the narrowest beam angle. The luminous intensity at the center was measured at 7.7×10 6 cd.The distance between the light source and the point where the illuminance was 1 lx was calculated to be 2.8 km. The power consumption of the system was 95 W, which is only 9.5% of that of the 1 kW xenon searchlight, and the beam angle was 1.03°. In a site experiment, it was confirmed that the light ray reflected from the LED searchlight proceeds forward without any diffusion because of the narrow beam angle.

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Section: Ray-tracingmentioning

confidence: 99%

Study on the Design of a High Condensing LED Searchlight

Kim¹,

Kim²,

Kim³

et al. 2015

Transactions on Electrical and Electronic Materials

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“…White-light-emitting diodes (WLEDs) are considered as the next generation of green lighting sources because of their low energy consumption, high output efficiency, and environmental friendliness, compared with traditional incandescent and fluorescent lamps [ 1 , 2 , 3 , 4 ]. At present, there are two methods are available for generating white light: the multichip combination method, in which red, green, and blue LED chips are used in combination, and the light conversion method, in which various phosphors are excited by blue, ultraviolet (UV), or near-UV LED chips [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Multiple Energy Transfer in Luminescence-Tunable Single-Phased Phosphor NaGdTiO4: Tm3+, Dy3+, Sm3+

et al. 2020

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Advances in solid-state white-light-emitting diodes (WLEDs) necessitate the urgent development of highly efficient single-phase phosphors with tunable photoluminescence properties. Herein, the Tm3+, Dy3+, and Sm3+ ions are incorporated into the orthorhombic NaGdTiO4 (NGT) phosphors, resulting in phosphors that fulfill the aforementioned requirement. The emission spectrum of Tm3+ ions overlaps well with the adsorption spectra of both Dy3+ and Sm3+ ions. Under the excitation at 358 nm, the single-phase NaGdTiO4: Tm3+, Dy3+, Sm3+ phosphor exhibits tunable emission peaks in the blue, yellow, and red regions simultaneously, resulting in an intense white-light emission. The coexisting energy transfer behaviors from Tm3+ to Dy3+ and Sm3+ ions and the energy transfer from Dy3+ to Sm3+ ions are demonstrated to be responsible for this phenomenon. The phosphors with multiple energy transfers enable the development of single-phase white-light-emitting phosphors for phosphor-converted WLEDs.

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Luminescence properties of alternating current light-emitting diodes (AC LEDs) through operating circuit and electrical characteristics

Gao

Zhang

et al. 2016

Optik

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Optical performance of a versatile illumination system for high divergence LED sources

Cited by 6 publications

References 7 publications

Study on the Design of a High Condensing LED Searchlight

Study on the Design of a High Condensing LED Searchlight

Multiple Energy Transfer in Luminescence-Tunable Single-Phased Phosphor NaGdTiO4: Tm3+, Dy3+, Sm3+

Luminescence properties of alternating current light-emitting diodes (AC LEDs) through operating circuit and electrical characteristics

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