Phosphor: Difference between revisions

From TekWiki
Jump to navigation Jump to search
No edit summary
No edit summary
(8 intermediate revisions by 3 users not shown)
Line 1: Line 1:
The CRT in Tektronix oscilloscopes often had a standard phosphor based on the intended application
In a context of chemistry, or when referring to [[cathode-ray tube]]s, '''phosphor''' refers to any of various compounds of transition metals or of rare earths that exhibits phosphorescence. This is not to be confused with the chemical element ''phosphorus'' (symbol P,  atomic number of 15) which emits light due to chemiluminescence, not phosphorescence.
of the instrument.  On request, other phosphors were available.  The phosphor affects:
 
CRT phosphors were standardized beginning around World War II and designated by the letter "P" followed by a number.
In most early scopes, the standard phosphor was P-2. By the late 1950s, P-31 became dominant.  For scopes primarily used with photographic recording, the blue P-11 phosphor was common.
 
The choice of phosphor for a CRT is based on the intended application of the instrument.  The phosphor affects:


* trace color
* trace color
Line 9: Line 13:
* resistance to burns
* resistance to burns


Further reading:
[[File:Phosphor summary table.jpg|750px]]
 
[[File:Phosphors.jpg|750px]]
 
[[File:Phosphor reference table rev c 1966.jpg|750px]]
 
[[File:Phosphor decay table rev a 1966.jpg|750px]]
 
== Further reading ==


* http://www.bunkerofdoom.com/tubes/crt/crt_phosphor_research.pdf
* http://www.bunkerofdoom.com/tubes/crt/crt_phosphor_research.pdf
* [http://w140.com/062-0852-01_Cathode-Ray_Tubes_Jul69.pdf Tektronix Circuit Concepts: Cathode Ray Tubes (see chapters 9 through 16)]
* [http://w140.com/062-0852-01_Cathode-Ray_Tubes_Jul69.pdf Tektronix Circuit Concepts: Cathode Ray Tubes (see chapters 9 through 16)]
<gallery>
* [http://www.ko4bb.com/manuals/download.php?file=Tektronix/Tektronix_C-50_to_C-53_Cameras_Tek_C-50_to_C-53_Camera_Systems_Service_Manual.pdf C50 series camera manual, pages 3-1 to 3-7] - detailed data on P1, P2, P7, P11 and P31 phosphors
File:Phosphors.jpg|Table of Standard Phosphors
 
</gallery>


[[Category:Cathode ray tubes]]
[[Category:Cathode ray tubes]]

Revision as of 04:45, 28 November 2019

In a context of chemistry, or when referring to cathode-ray tubes, phosphor refers to any of various compounds of transition metals or of rare earths that exhibits phosphorescence. This is not to be confused with the chemical element phosphorus (symbol P, atomic number of 15) which emits light due to chemiluminescence, not phosphorescence.

CRT phosphors were standardized beginning around World War II and designated by the letter "P" followed by a number. In most early scopes, the standard phosphor was P-2. By the late 1950s, P-31 became dominant. For scopes primarily used with photographic recording, the blue P-11 phosphor was common.

The choice of phosphor for a CRT is based on the intended application of the instrument. The phosphor affects:

  • trace color
  • maximum trace brightness
  • trace width
  • persistence time
  • writing rate
  • resistance to burns

Further reading