Hi Friends,

Even as I launch this today ( my 80th Birthday ), I realize that there is yet so much to say and do. There is just no time to look back, no time to wonder,"Will anyone read these pages?"

With regards,
Hemen Parekh
27 June 2013

Now as I approach my 90th birthday ( 27 June 2023 ) , I invite you to visit my Digital Avatar ( www.hemenparekh.ai ) – and continue chatting with me , even when I am no more here physically

Monday 4 December 2017

Thank You


Dear Amitabh,


It was a pleasure listening to you yesterday ( Chai and Why ?  /  Prithvi Theatres )

I reproduce below , a “ draft “ of my blog , which I plan to upload on my blogging site , if it is OK with you

Please point out corrections – if any – to be made before uploading

Once uploaded , it is my practice to send it as emails to the Central Cabinet Ministers and other Policy Makers


With Regards,

hemen  parekh 
( M ) +91 - 98,67,55,08,08


Chai and Why ?


This is the name of a “ citizen awareness “ program being held every Sunday ( 11 am ) at Prithvi Theatres ( Juhu / Mumbai ) . I believe , it is arranged by TIFR and now , celebrating 10th year


I attended yesterday’s program , which focussed on OLED ( Organic Light Emitting Diodes )


It was a demo-lecture by Prof Amitabh Banerji of the University of Koln ( Germany )


Prof Banerji is currently touring India with a few of his students and giving demo-lectures at various Indian Universities


During the talk , Prof Banerji actually “ constructed “ a small OLED on a piece of glass , with the help of tools / chemicals that he carried in a KIT ( - a small plastic bag )


In Germany , Koln University sells this KIT BAG for Euro 500


Prof Banerji has given a few KITS to Prof Bhattachara of TIFR , for propagating the concept of OLED


I will not go into the detailed ( but, extremely SIMPLE ) process of constructing a OLED , within a few minutes , even by a School-going child !


When that small ( 2 inch by 2 inch ) piece of glass , turned into a OLED , audience could see ( on the screen ) , actual glow of light when a small current was passed through the conducting layer on the glass


By reversing the process and shining a bright light ( from a torch or a lamp ) , it was shown that a small current flowed in the circuit !

Even now , it is possible to fabricate OLED using thin plastic membranes , which may , someday soon , replace the screens of smart phones . Such phones may come to the market next year



I asked Prof Banerji :


“  Can flexible plastic OLED of much higher capacities , be mounted on roof-tops of Electric Cars , to produce enough power to charge a small Lithium Battery ?


Can this replace glass-based PV Solar Panels which ISRO mounted on an OMNI ( in May 2017 ) to charge its battery for 150 Km run ?


If technology advances sufficient enough for commercial production of high capacity flexible OLED Solar Power generator for car roof-tops , can this mean continuous charging of Li-ion batteries , eliminating ( - or , at least , vastly reducing ) the need for Battery Charging Stations for India’s proposed 6 million Electric Vehicles on the roads , by 2022 ? “



Prof Banerji replied :


“ Very good question .

This is bound to happen , may be within 10 years . Unfortunately , current constraints are :

#   Plastic-based OLED have a low conversion efficiency , of around 6 % as against 16 % - 25 % for a glass-based PV cell


#   These are unstable and rapidly degrade in the presence of Oxygen and Ultra Violet light


But advantage is :
a plastic-based OLED does not need direct sunlight . It can generate power , even in a diffused / indirect light ! 

Companies are experimenting with even OLED embedded wall paint for painting house exteriors , which can supply electricity to entire building “



If our Policy Makers ( in the Ministry for Renewable Energy / NITI Aayog / Transport Ministry ) want clarifications / directions , I am sure Prof Banerji ( a.banerji@uni-koeln.de  ) would be happy to help
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