ELECTROTHERMAL CHARACTERIZATION APPLIED TO THE STUDY OF
CHROMATICITY COORDINATES IN RGB LEDS
1
1
1
William Dotto Vizzotto , Guilherme Gindri Pereira , Rodrigo Cordeiro , Vitor Cristiano
1
1
1
2
Bender , Marco Antônio Dalla Costa , Tiago Bandeira Marchesan , Elvo Calixto Burini Jr.
1
2
- GEDRE, Universidade Federal de Santa Maria, Santa Maria – RS, Brasil
- Instituto de Eletrotécnica e Energia , Universidade de São Paulo, São Paulo – SP, Brasil
Santa Maria – RS
[email protected]
The purpose of this paper is the development of a methodology to analyze the
chromaticity coordinates in RGB LEDs, considering the influence of junction
temperature. A review of theoretical concepts of colorimetry was performed, as well as
a demonstration of the luminous flux equation that considers the effect of thermal and
electrical characteristics of LEDs. The equations which represent the heatsink and
junction temperature of the LEDs are compared with finite element simulations and
experimental measurements. The equation of the luminous flux is related to the
matrices of the tristimulus, to achieve a precise relationship between the LED's
operation condition and the desired color. Finally, tests in order to verify the data
mathematically obtained in comparison with the data experimentally obtained are
performed and shown.
_____________________
12th Brazilian Power Electronics Conference (COBEP2013), p.1146-1152, DOI: 10.1109/COBEP.2013.6785259; 27th to
31st, October¸ 2013 Gramado, RS, Brazil.