The phrase "I emphasised to" is correct and usable in written English.
You can use it when you want to indicate that you said something with particular emphasis or importance. For example: "I emphasised to the group that we must finish the project by the end of the week."
"I emphasised to Prime Minister Abe the importance of resolving this peacefully, keeping the rhetoric low and not taking provocative actions".
"I emphasised to Monsieur Cazeneuve that we should transfer as many minors as possible from the camp eligible under the Dublin regulation before clearance commences, with the remainder coming over within the next few days of operation," Rudd told the Commons.
"I emphasised to the players before the game the importance of discipline," explained McNamara ruefully.
After the 9/11 attacks, he said, the "US and others – I emphasise to you, others – realised that we are dealing with a new world where people are willing to blow themselves up.
However, as I emphasise to the fledgling writers who come and attend my Guardian Masterclass courses, writing novels for a living is hard – unimaginably hard, for those who have not tried it.
To deny this mother in the circumstances of this case the right to speak out – and, I emphasise, to speak out, if this is her wish, using her own name and displaying her own image – would be affront not merely to the law but also, surely, to any remotely acceptable concept of human dignity and, indeed, humanity itself".
"I've always the emphasised to the players just how important this trophy is to our club and how proud we are of our history.
I have no wish at all, I must emphasise, to see bulldozers demolish institutions of proven academic excellence.
The one thing I'd emphasise to the most important people in this situation, namely students who are going to be teachers (most important because it's in the early stages that we form all our habits), is this: Whenever you can, don't read stories like this to children.
"I emphasised today to get the first goal against what is a young side and it might deflate them," he said.
"I want to emphasise to each and every one of you that the Australian Muslim community is respected and valued," he said in a speech to the Islamic Council of Victoria on Monday.
