White LEDs with limit luminous efficacy

In most promising widespread gallium nitride based LEDs emission is generated in the blue spectral region with a maximum at about 450 nm which is converted to visible light with the desired spectrum by means of phosphor. The thermal energy in the conversion is determined by the difference in the ene...

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Bibliographic Details
Main Authors: Lisitsyn, V. M., Lukash, V. S., Stepanov, S. A., Yangyang, Ju
Format: Conference Proceeding
Language:English
Subjects:
CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
CONVERSION
Effectiveness
EFFICIENCY
EMISSION
Energy conversion efficiency
EXCITATION
GALLIUM NITRIDES
HEAT LOSSES
HEATING
Light emitting diodes
Luminous efficacy
REDUCTION
SPECTRA
Thermal energy
VISIBLE RADIATION
YIELDS
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Summary:In most promising widespread gallium nitride based LEDs emission is generated in the blue spectral region with a maximum at about 450 nm which is converted to visible light with the desired spectrum by means of phosphor. The thermal energy in the conversion is determined by the difference in the energies of excitation and emission quanta and the phosphor quantum yield. Heat losses manifest themselves as decrease in the luminous efficacy. LED heating significantly reduces its efficiency and life. In addition, while heating, the emission generation output and the efficiency of the emission conversion decrease. Therefore, the reduction of the energy losses caused by heating is crucial for LED development. In this paper, heat losses in phosphor-converted LEDs (hereinafter chips) during spectrum conversion are estimated. The limit values of the luminous efficacy for white LEDs are evaluated.
ISSN:0094-243X
1551-7616
DOI:10.1063/1.4937863