Study of Phosphors for White LEDs

Abstract

This paper presents the results of studying four samples of phosphor for white LED manufacture, including the results of spectrum analysis of the phosphors and colorimetric analysis data for light emission values of LEDs containing these phosphors. The paper also presents the results of analyzing colorimetric and brightness characteristics of phosphor-coated LED compound 1 .

Demystification of luminescence properties and the near imperceptible thermal quenching of Sm3+‐doped tungstate phosphors

“…To determine CCT we made use of the McCamy formula [34] $$$$ \mathrm{CCT}=5520.33-6823\mathrm{n}+3525{\mathrm{n}}^2-449{\mathrm{n}}^3 $$$$ where n is given by $$$$ n=\frac{\ \left({\mathrm{x}}_{\mathrm{p}}-{\mathrm{x}}_{\mathrm{o}}\right)\ }{\ \left({\mathrm{y}}_{\mathrm{p}}-{\mathrm{y}}_{\mathrm{o}}\right)\ } $$$$ …”

Synthesis and Characterization of YAG:Ce Phosphor by Microwave Induced Combustion Synthesis with Different Fuel Sources

“…Due to the spin-orbit coupling, the ground state of Ce 3+ is split into two subband, namely 2 F7/2 and 2 F5/2, with energy difference of 2200 cm −1 . The excited state, 5 D1 configuration is further split into 5 subbands, with upper two band known as eg , 2 D3/5 orbitals and t2g , 2 D5/2, by the crystal field [27], [28]. When the phosphor is excited with blue light, Ce 3+ ions emits green light from 5d( 2 D3/5) to 4f( 2 F5/2) transition and yellow light from transition 5d( 2 D3/5) to 4f( 2 F7/2).…”

Parameters Investigation of Phosphors for Solid State Lighting

“…The chromaticity coordinates (colorimetric analysis) of the studied phosphor samples have been determined when the spectrocolorimeter sensor has been directly illuminated by LBE emission. The LBE supply voltage is U = 60 V, the LBE consumption current is I = 10 mA [5].…”