"especially developed" is correct and can be used in written English.
It is often used to describe something that has been created or improved in a special or unique way. Example sentence: The new computer program was especially developed for professionals in the healthcare industry.
Virtually all photographic work is done on film coated with high-contrast emulsions especially developed for graphic arts work.
As a scientific enterprise, however, the investigation of perception has especially developed as part of the larger discipline of psychology.
Now governments, and especially developed nations, must go back to do their homework so they can put their plans on the table ahead of the Paris conference.
"But none of these big brands is offering a product which can be worn on the golf course or which is especially developed for golfers".
Now, as an associate senior engineer at the Micro Space Systems Laboratory's advanced mission research center, he is controlling the flight patterns of satellites, using a computer display with a Braille system especially developed for him.
The latest comes a month before president Barack Obama hosts a special meeting during the annual UN general assembly of world leaders aimed at urging more countries, especially developed ones, to contribute more troops, money and skills.
It was especially developed for applications in recycling technology.
There are some MAC protocols that have been especially developed for wireless sensor networks.
The TB parameters were especially developed for hydrocarbon molecules and nanostructures.
This is a six-item questionnaire especially developed for repeated measurements.
The MicroResp™ system was especially developed to study soil microbial communities.
