this._emitterservice.setDetails("TEST")
In emitter service
@Output() setDetailsToEmit: EventEmitter<any> = new EventEmitter();
setDetails(details){
    this.setDetailsToEmit.emit(details);
}
getDetails(){
    return this.setDetailsToEmit;
}
In other component(get details)
this._emitterservice.getDetails().subscribe(value => {
        this.selectedItem = value
        console.log(this.selectedItem) //able to see but unable to view in HTML
    });