Topic 'OPT301' in forum 'Electronics' - dslreports.com

Re: OPT301

Fri, 19 Dec 2014 04:44:31 EDT

lutful posted :

Blue LEDs from the 1960s?!?
... August 1989, Cree Inc. introduced ... SiC LEDs

Yes, several researchers managed to make crude "blue-ish" LEDs in the 1960s, but they were not brought to market. Vassily Tsvetkov finally produced "commercial" grade blue LED at Siemens ... in 1977!

***
Injected Light Emission of Silicon Carbide Crystals
K. LEHOVEC, C. A. ACCARDO, AND E. JAMGOCHIAN

Signal Corps Engineering Laboratories, Fort Monmouth, New Jersey
(Received April 5, 1951)

I. INTRODUCTION

SOME silicon carbide crystals emit "cold" light while current passes. 1-7 Two types have been reported : (a) a bluish light and (b) a yellow light, the type emitted depending on the direction of current flow.
***

Re: OPT301

Fri, 19 Dec 2014 03:26:13 EDT

vintagewino posted : Might try Digikey. $73 each! Yeah, bloody expensive.
»www.digikey.com/product- ··· s=opt301

Looks like something they got when they bought Burr-Brown. BB had some neat electronic items, but they were ghastly in price. Several years ago, needed a ISO100 from BB. Scary!

Unfortunately, a lot of these unusual devices are quite specialized, and the call is low. Ergo, the ridiculous price.

Oh ... BLUE LED's in the 60's? No chance! Got some samples of the new, wonderful RED LED's that had just come out in ~67. At that time, shorter wavelengths were still a dream.

Re: OPT301

Fri, 19 Dec 2014 00:43:13 EDT

aurgathor posted : Blue LEDs from the 1960s?!?

quote:
In August 1989, Cree Inc. introduced the first commercially available blue LED based on the indirect bandgap semiconductor, silicon carbide. SiC LEDs had very low efficiency, no more than about 0.03%, but did emit in the blue portion of the visible light spectrum.

»en.wikipedia.org/wiki/Li ··· ng_diode
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.sig

Re: OPT301

Wed, 17 Dec 2014 22:29:06 EDT

lutful posted :

said by SparkChaser:

Didn't Cree start with SiC for LED?

I think SiC was used in the original blue-ish LEDs from 1960s. I see many DIY videos on Youtube. Higher brightness SiC/GaN and InGaN blue LEDs came later.

Re: OPT301

Wed, 17 Dec 2014 16:55:00 EDT

SparkChaser posted :

said by lutful:

But I learned that new gadgets use Silicon Carbide photodiodes for the UV spectrum.

Yes, thanks. I wanted the entire vis spectrum and the integrated amp. Didn't Cree start with SiC for LED? Not sure :)

They make sense though and I'll look into it if the I narrow the spectrum to the UV range.
--
The good thing about science is that it's true whether or not you believe in it. ― Neil deGrasse Tyson

No matter where you go there you are - Confucius

Re: OPT301

Wed, 17 Dec 2014 12:48:19 EDT

lutful posted :

said by SparkChaser:

... the UV response I want ...

I asked around for OPT301, no luck.

But I learned that new gadgets use Silicon Carbide photodiodes for the UV spectrum.

Re: OPT301

Mon, 15 Dec 2014 17:12:06 EDT

SparkChaser posted : Yeah Tom, the price is amazing. I think it used to be about a 3X difference now it's almost 10.

I have not had a chance to go over the specs but I think the main difference is the package. The metal has a glass or quartz window which bumps up the UV response.

Re: OPT301

Mon, 15 Dec 2014 12:22:34 EDT

tschmidt posted :

said by SparkChaser:

they are asking 2 arms and a leg for it

Wow no kidding, even eBay China prices. Looks like it was originally a Burr Brown design.

/tom

OPT301

Mon, 15 Dec 2014 10:06:33 EDT

SparkChaser posted : Anybody know of these being sold at a reasonable price. Maybe out of somebodies basement.
»www.ti.com/product/opt301

It's an old part but they are asking 2 arms and a leg for it.

There is a plastic equivalent (the 101) but it lack the UV response I want. I should have left with a few when I retired.
--
The good thing about science is that it's true whether or not you believe in it. ― Neil deGrasse Tyson

No matter where you go there you are - Confucius