IEA 4E SSL ANNEX INTERLABORATORY COMPARISON OF GONIOPHOTOMETERS MEASURING SOLID STATE LIGHTING PRODUCTS – RESULTS

2021 ◽  
Author(s):  
Y. Ohno ◽  
G. Zissis ◽  
J. Gaudemer ◽  
J. Dubard ◽  
J.S. Oh ◽  
...  
Keyword(s):  
Solid State ◽  
Interlaboratory Comparison ◽  
Near Field ◽  
International Energy Agency ◽  
Cone Angle ◽  
Luminous Flux ◽  
Test Method ◽  
Solid State Lighting ◽  
Energy Agency ◽  
Field Type

The global interlaboratory comparison (IC 2017) on measurements of solid-state lighting (SSL) products with goniophotometers was conducted under the International Energy Agency 4E Solid State Lighting Annex with 36 participating laboratories from 19 countries with a total of 42 goniophotometric instruments including mirror-type, near-field type and source-rotating type goniophotometers. A narrow-beam LED lamp and three different types of LED luminaires, including a street lighting luminaire, were used as comparison artefacts for measurements of 16 different quantities. These included electrical, photometric, and colorimetric quantities, and goniophotometric quantities such as centre beam intensity, beam angle, partial flux (15° cone angle), and angular colour uniformity. CIE S 025 was used as the test method. The results demonstrated overall good agreement on luminous flux and colour quantities, however, larger variations and various problems were identified in goniophotometric quantity results. Near-field type and source-rotating type goniophotometers showed equivalent accuracies overall to those of far-field mirror type goniophotometers.

scholarly journals Glass crystallization making red phosphor for high-power warm white lighting

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Tao Hu ◽  
Lixin Ning ◽  
Yan Gao ◽  
Jianwei Qiao ◽  
Enhai Song ◽  
...  
Keyword(s):  
Solid State ◽  
High Power ◽  
Rapid Development ◽  
Thermal Quenching ◽  
Luminous Flux ◽  
Aluminosilicate Glass ◽  
Solid State Lighting ◽  
Red Phosphor ◽  
Red Phosphors ◽  
Significant Step

AbstractRapid development of solid-state lighting technology requires new materials with highly efficient and stable luminescence, and especially relies on blue light pumped red phosphors for improved light quality. Herein, we discovered an unprecedented red-emitting Mg2Al4Si5O18:Eu2+ composite phosphor (λex = 450 nm, λem = 620 nm) via the crystallization of MgO–Al2O3–SiO2 aluminosilicate glass. Combined experimental measurement and first-principles calculations verify that Eu2+ dopants insert at the vacant channel of Mg2Al4Si5O18 crystal with six-fold coordination responsible for the peculiar red emission. Importantly, the resulting phosphor exhibits high internal/external quantum efficiency of 94.5/70.6%, and stable emission against thermal quenching, which reaches industry production. The maximum luminous flux and luminous efficiency of the constructed laser driven red emitting device reaches as high as 274 lm and 54 lm W−1, respectively. The combinations of extraordinary optical properties coupled with economically favorable and innovative preparation method indicate, that the Mg2Al4Si5O18:Eu2+ composite phosphor will provide a significant step towards the development of high-power solid-state lighting.

Preliminary report on the International Energy Agency mode of occurrence inter-laboratory comparison; Phase I, USGS results

1999 ◽  
Author(s):  
Curtis A. Palmer ◽  
Allan Kolker ◽  
Jason C. Willett ◽  
Stanley J. Mroczkowski ◽  
Robert B. Finkelman ◽  
...  
Keyword(s):  
Phase I ◽  
Preliminary Report ◽  
International Energy Agency ◽  
Energy Agency ◽  
Mode Of Occurrence

Solid-State Lighting R&D Plan - 2015

2015 ◽  
Author(s):  
Norman Bardsley ◽  
Stephen Bland ◽  
Monica Hansen ◽  
Lisa Pattison ◽  
Morgan Pattison ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Lighting

Yolk–shell structured Bi2SiO5:Yb3+,Ln3+ (Ln = Er, Ho, Tm) upconversion nanophosphors for optical thermometry and solid-state lighting

CrystEngComm ◽  
2020 ◽  
Vol 22 (26) ◽  
pp. 4438-4448 ◽  
Author(s):  
Dongxun Chen ◽  
Liangliang Zhang ◽  
Yanjie Liang ◽  
Weili Wang ◽  
Shao Yan ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Lighting ◽  
Optical Thermometry

Bi2SiO5:Yb3+,Er3+ yolk–shell nanophosphors have been successfully synthesized, which are expected to find important applications in optical thermometry and solid-state lighting.

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