Low Frequency Noise Characteristics and Aging Processes of High Power White Light Emitting Diodes

2009 ◽  
Author(s):  
V. Palenskis ◽  
J. Matukas ◽  
B. Šaulys ◽  
S. Pralgauskaite ◽  
V. Jonkus ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diodes ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Light Emitting ◽  
Noise Characteristics ◽  
White Light Emitting Diodes

Reliability investigation of light-emitting diodes via low frequency noise characteristics

2015 ◽  
Vol 55 (1) ◽  
pp. 52-61 ◽  
Author(s):  
Sandra Pralgauskaitė ◽  
Vilius Palenskis ◽  
Jonas Matukas ◽  
Justinas Glemža ◽  
Grigorij Muliuk ◽  
...  
Keyword(s):  
Light Emitting Diodes ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Light Emitting ◽  
Noise Characteristics

Noise characteristics and reliability of high power white light emitting diodes based on nitrides

2008 ◽  
Author(s):  
J. Matukas ◽  
V. Palenskis ◽  
J. Vyšniauskas ◽  
B. Šaulys ◽  
S. Pralgauskaitė ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
Noise Characteristics ◽  
White Light Emitting Diodes

scholarly journals Review of Low-Frequency Noise Properties of High-Power White LEDs during Long-Term Aging

Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 13
Author(s):  
Vilius Palenskis ◽  
Jonas Matukas ◽  
Justinas Glemža ◽  
Sandra Pralgauskaitė
Keyword(s):  
Output Power ◽  
Blue Light ◽  
White Light ◽  
High Power ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Phosphor Layer ◽  
Light Emitting

Low-frequency noise investigation is a highly sensitive and very informative method for characterization of white nitride-based light-emitting diodes (LEDs) as well as for the evaluation of their degradation. We present a review of quality and reliability investigations of high-power (1 W and 3 W) white light-emitting diodes during long-term aging at the maximum permissible forward current at room temperature. The research was centered on the investigation of blue InGaN and AlInGaN quantum wells (QWs) LEDs covered by a YAG:Ce3+ phosphor layer for white light emission. The current-voltage, light output power, and low-frequency noise characteristics were measured. A broadband silicon photodetector and two-color (blue and red) selective silicon photodetectors were used for the LED output power detection, which makes it possible to separate physical processes related to the initial blue light radiation and the phosphor luminescence. Particular attention was paid to the measurement and interpretation of the simultaneous cross-correlation coefficient between electrical and optical fluctuations. The presented method enables to determine which part of fluctuations originates in the quantum well layer of the LED. The technique using the two-color selective photodetector enables investigation of changes in the noise properties of the main blue light source and the phosphor layer during the long-term aging.

Glass-ceramic composites for high-power white-light-emitting diodes

2021 ◽  
Author(s):  
Alessandro Longato ◽  
Sebastiano Picco ◽  
Lorenzo Moro ◽  
Matteo Buffolo ◽  
Carlo De Santi ◽  
...  
Keyword(s):  
White Light ◽  
High Power ◽  
Glass Ceramic ◽  
Light Emitting Diodes ◽  
Ceramic Composites ◽  
Light Emitting ◽  
White Light Emitting Diodes

Sn–P–F containing glass matrix for the fabrication of phosphor-in-glass for use in high power LEDs

RSC Advances ◽  
2016 ◽  
Vol 6 (113) ◽  
pp. 111640-111647 ◽  
Author(s):  
Heeyeon Yoo ◽  
Yoshihiro Kouhara ◽  
Hee Chang Yoon ◽  
Sang Jun Park ◽  
Ji Hye Oh ◽  
...  
Keyword(s):  
Melting Point ◽  
White Light ◽  
High Power ◽  
Glass Ceramic ◽  
Glass Matrix ◽  
Light Emitting Diodes ◽  
Light Emitting ◽  
White Light Emitting Diodes

In this study, we introduce a low-melting-point (MP) glass ceramic (GlaC) material which can be used to fabricate a phosphor-in-glass (PiG) with Y3Al5O12:Ce3+ (YAG) phosphor for the realization of high-power white-light-emitting diodes (WLEDs).

Low-frequency noise of GaN-based ultraviolet light-emitting diodes

2005 ◽  
Vol 97 (12) ◽  
pp. 123107 ◽  
Author(s):  
S. L. Rumyantsev ◽  
S. Sawyer ◽  
M. S. Shur ◽  
N. Pala ◽  
Yu. Bilenko ◽  
...  
Keyword(s):  
Ultraviolet Light ◽  
Light Emitting Diodes ◽  
Low Frequency ◽  
Frequency Noise ◽  
Low Frequency Noise ◽  
Light Emitting ◽  
Ultraviolet Light Emitting Diodes
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