SPECTRA (NORMAL & NARROWBAND) OF ELECTROSPELL PHOSPHOR LEDS


This web page will be for nothing but spectra of 10mm, 8mm, 5mm, 3mm, and SMD LEDS (driven at 20mA to 60mA; with the exception of the LED in the Motion-Sensing Spotlight):

Ocean Optics USB2000 Spectrometer donated by P.L.
As of 10-10-07, I've been using a PC2000-ISA Spectrometer from Ocean Optics that I received several years ago, but that I didn't have a home for until now.
As of 03-08-08, I once again have the USB2000 spectrometer, enabling color spectra again.
As of 09-19-09, I no longer have the PC2000-ISA; it was sold to prevent an eviction.

SPECTRA (NORMAL & NARROWBAND) OF ELECTROSPELL LEDs (Received 03-15-12; tested 03-16-12):

All spectra were performed with an If (forward current) of 19.280mA, using an American Opto Plus LED Tester. Beam cross-sectional analyses were conducted with If=48.749mA.



Spectrafill Nonphosphor Broadband Blue LED (.PDF file; you'll need a .PDF reader like Adobe Acrobat to open)



Beam terminus photograph of the Spectrafill Nonphosphor Broadband Blue LED at ~16 inches (~40.6cm).
Intensity measures 800mcd on an Amprobe LM631A light meter.
Forward voltage (Vf) was 3.999 volts at an If=19.28mA.

Viewing angle is 60° to half-intensity;
this is normally how this measurement is taken.


Spectrographic plot
Spectrographic analysis of the Spectrafill Nonphosphor Broadband Blue LED.
Spectral line halfwidth is ~57nm -- thus making it a truly broadband LED.
This lamp has a spectral profile not at all dissimilar to a "broadband 430nm blue" LED, composed of an InGaN light-emitting layer upon a SiC substrate. That would most definitely explain the limited intensity of 800mcd here.


Spectrographic plot
Spectrographic analysis of the Spectrafill Nonphosphor Broadband Blue LED; spectrometer's response narrowed to a band between 405nm and 455nm to pinpoint peak emission wavelength at 422.444nm.


Beam cross-sectional analysis
Beam cross-sectional analysis.

*** VERY IMPORTANT***!!!
Light output of this LED was a bit low to obtain an accurate reading here!!!




Spectrafill Phosphor Green LED (.PDF file; you'll need a .PDF reader like Adobe Acrobat to open)



Beam terminus photograph of the Spectrafill Phosphor Green LED at ~16 inches (~40.6cm).
Intensity measures 4,480mcd on an Amprobe LM631A light meter.
Forward voltage (Vf) was 3.096 volts at an If=19.28mA.

Viewing angle is 60° to half-intensity;
this is normally how this measurement is taken.


Spectrographic plot
Spectrographic analysis of the Spectrafill Phosphor Green LED.
Spectral line halfwidth is ~92nm -- thus making it a truly broadband LED.


Spectrographic plot
Spectrographic analysis of the Spectrafill Phosphor Green LED; spectrometer's response narrowed to a band between 500nm and 550nm to pinpoint phosphor peak emission wavelength at 517.341nm.


Beam cross-sectional analysis
Beam cross-sectional analysis.

*** VERY IMPORTANT***!!!
Light output of this LED was a bit low to obtain an accurate reading here!!!




Spectrafill Phosphor Red LED (.PDF file; you'll need a .PDF reader like Adobe Acrobat to open)



Beam terminus photograph of the Spectrafill Phosphor Red LED at ~16 inches (~40.6cm).
Intensity measures 1,770mcd on an Amprobe LM631A light meter.
Forward voltage (Vf) was 3.064 volts at an If=19.28mA.

Viewing angle is 60° to half-intensity;
this is normally how this measurement is taken.

This LED has a hot magenta color to the unaided eye; this is caused by the blue native emission "leaking" through; it is advertised that this "bleedthrough" can be safely ignored when using the LED in an RGB (Red/Green/Blue) array.

From the person who sent the Spectrafill LEDs comes this (no changes to syntax or grammar were made; English is very likely not his first language):

"The red Spectrafill LED does look pink because of the residual LED chip pump light. We have attempted to reduce this blue component by adding a scattering agent to the phosphor so as to couple the blue light more efficiently to the phosphor, increasing the red component and decreasing the blue component. This has worked to a large extent but complete removal of blue has not been possible. The residual blue, however, plays a certain role in that when the three LEDs are used together to generate white light this blue component adds to the relatively weak emission from the blue LED to add sufficient blue component. We recommend using two blue LEDs with a red and a green LED for this purpose. We are not concerned about the blue component in the red LED but there do is a concern about the low powers available from the blue LED and hence we have to make available ordinary blue LEDs to make a working solution when power LEDs are being used."



Spectrographic plot
Spectrographic analysis of the Spectrafill Phosphor Red LED.
Spectral line halfwidth is ~55nm -- thus making it a truly broadband LED.


Spectrographic plot
Spectrographic analysis of the Spectrafill Phosphor Red LED; spectrometer's response narrowed to a band between 620nm and 670nm to pinpoint phosphor peak emission wavelength (well, two peaks actually), the first at 643.982nm and the second at 648.320nm.


Spectrographic plot
Spectrographic analysis of the Spectrafill Phosphor Red LED; spectrometer's response narrowed to a band between 420nm and 470nm to pinpoint peak native emission wavelength, which is 447.500nm.


Beam cross-sectional analysis
Beam cross-sectional analysis.

*** VERY IMPORTANT***!!!
Light output of this LED was a bit low to obtain an accurate reading here!!!










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WHITE 5500-6500K InGaN+phosphor 
ULTRAVIOLET 370-390nm GaN 
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