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From: Martin Brown <'''newspam'''@nonad.co.uk>
Newsgroups: sci.electronics.design
Subject: Re: OT: light altering paint for greenhouses could help lengthen
 fruit growing season in the UK
Date: Sun, 24 Nov 2024 09:29:51 +0000
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On 24/11/2024 06:43, Jan Panteltje wrote:
> Light-altering paint for greenhouses could help lengthen the fruit growing season in the UK
>   https://www.sciencedaily.com/releases/2024/11/241120122018.htm
> Summary:
>   New spray developed by scientists could help boost UK farming and increase the UK's food security.
> 
> Paper:
>   https://onlinelibrary.wiley.com/doi/10.1002/admt.202400977
> 
> stuff they use, quote:
> '
>   In this paper, we develop an approach based on readily prepared and cheap
>   Eu3+-containing polyoxotitanium cages (Eu-POTs) which, we show,
>   possess the necessary design features listed before.
>   Having established the ground rules for selective modification,
>   we introduce a working prototype luminophore with high PLQY (>60%)
>   which is soluble in a range of commercial plastics, including water-based
>   acrylic paint that can be sprayed onto conventional glass greenhouses
>   in an agricultural environment.

There are other much older organic dye technologies that will down 
convert blue photons to red like dayglo dyes  Eosin, Rhodamine, Rubrene 
etc (although some of them are a bit carcingenic others are quite 
harmless). They form the basis for pumped tunable dye lasers.

Plants are green because the very first photosynthetic life on earth had 
already grabbed the low hanging fruit of energetic green and blue 
photons using rhodopsin based proton pumps and red photosynthetic 
pigments. You can still see them living in rock pool puddles today.

https://en.wikipedia.org/wiki/Microbial_rhodopsin

And a closely related pigment lives on in our eyes in various slightly 
different forms giving us colour vision.

-- 
Martin Brown